Male perspective here. Studies have shown we've evolved to decide if we will have sex with someone within seconds of looking at them, our brains are sizing each other up and looking at symmetry for signs of good genetics. Once we've made that decision there's practically a baby on the way. All it takes is that one slip up nature is constantly guiding us towards.

You see that cute girl from across the room and you know the way she is looking at you that you both want it. You haven't even met yet but you both are thinking the same thing. As a man I may not yet consciously be thinking it yet but my body is already preparing. My cock might begin to swell if I catch the smell of her pheromones her body is conveniently and chemically conveying to my brain, saying "I'm ovulating" or "I'm fertile". Sometimes just my head gets really big and heavy while my shaft stays skinny. The weight of my head especially, rubbing around on its own as it engorges is just absolutely all consuming and annoying. If I can just release I'll feel better. If it's been a while this is how a mans body can just hijack his brain and he loses all common sense. Ejaculating inside specifically, becomes all I can think about, even if just ever present in the back of my mind, it will not go away. Masturbating helps but its not the same as being pulled deep inside by a willing partner and injecting sperm right into her cervix. I've never felt better in life than after doing that.

It's so much better to go raw, people are scared to go raw and you are using condoms even though your partner is on BC? Just take off the condom already, hormonal BC is so effective there's literally like a 1% chance, in a whole year! Just give into what your body needs. Many people don't even realize how much chemical bonding can happen when your man ejaculates inside you. We both absorb each others hormones and chemicals released during sex and they do bond us more each time we have sex. So ladies if you really want to bond with that guy you like, make sure to take off the condom and fuck often. They have proven that some components of semen cross right into the females bloodstream and go right to the brain where they drop off the message "release an egg, there's sperm" The amount of university research on sex is just ridiculous, in a sense that we are "set up" by nature, you don't really have a say, and most of us will make a baby eventually because of this.

Once a woman has my head in her hands or mouth, forget about it. Yeah I'm pretty weak, it's a fetish, but I know most of us just lose it. Whats turning me on around then is knowing that I am unable to stop myself once she goes past a certain point. She is totally in control and if she wants cum in her then I really have no choice in the matter. Once she caresses me enough my groin is going to pulsate with pleasure and the intensity builds until it will only feel better if my my tip just brushes against the lips of her pussy. That first touch releases an explosion of pleasure and the need to go deeper becomes the only thought in the world. The feeling of my painfully pressurized cock, sliding slowly between dripping wet receptive lips, which I know will provide sweet relief and draw me in further, too far to pull out. Once my head is inside it's becoming painfully hard, it's making me have to go deeper for relief. I like to tease my just my tip for as long as I can tolerate it, but the female vagina, and penis, are designed, literally designed so once a penis is inside it becomes very hard to pull out. We've evolved not to pull out, the winners stayed in and came hard and so must I. I love how the vagina just encourages my penis to keep going deeper, go a little deeper, it just feels better, don't resist. If your squeezing my swollen begging head at this point it's not even fair.

Once I'm first deep inside I feel better, it's the reward for getting all the way in, some relief, but only for a little while. Now all I can think about is sliding in and out faster so I can feel just a little bit better, still unable to think or care of anything else in the world. My body makes sure I don't stop, if I do it's just a matter of time before a mini orgasm triggers. It's my body saying Don't Stop! I'm so turned on at this point that there is nothing I can do but pump faster until I come. Sometimes it becomes hard work, like say after a few drinks and maybe you shouldn't have had sex but once you started.... you can't stop. For men at this point you might even want to stop but you can't. Sometimes I come in minutes and sometimes my body needs me to fuck for much longer. Whatever my body needs to get to the point of ejaculating, thats what I have to do. I say hard work because I feel the need to come no matter what, I have to get as deep as I can and fuck until I explode. I love it when my partner gently pulls me in. This is usually the second time my head becomes really large, right before orgasm to open up the vagina just a little bit more as my penis makes sure it's practically swollen in place, knotted no doubt as a large size male. Nature knows by this point you are parked right in front of the cervix. By this time I have not thought about anything but cumming for a long while. If my partner nudges me in or pulls just a little it can set me right off. By now the biological urges are so strong I hope I'm pumping a baby in, it doesn't matter and I don't have a choice.

I can't move, and my cock is convulsing and dripping just before exploding. I am unable to pull out and and trying to hold myself in my partner as deep as possible because it's the only way to get the most relief. If I cum deeper I feel better, at least for me. The first wave of semen always sneaks out, it comes out of nowhere and has been proven to be the most forceful spurt and contain the most sperm. I guess nature figures if you were even thinking of pulling out, good luck, your penis is now a firehose and there's a good chance millions of sperm will get inside that vagina even as you try to withdraw in time. For me this is the best part of the orgasm, of course nature put us on lock down about now, my mind is blank or I'm getting off on the fact that I am somehow pumping in like 150 million little sperms. It's really satisfying and I enjoy every long spurt. The more actual semen that comes out, the longer the orgasm, natures reward for that edging. If I pull out, the orgasm is not as good and I know I'm going to have blue balls until I come again. That has led me to never pull out and always make sure I finish. If not I am just so fucking annoyed by my unhappy throbbing penis that I am reminded of my duty to stay inside. After I come it feels best to just stay put, pulling out makes me ache if I do it too soon. If my partner wants me again and starts any thrusting within a couple minutes, I may not get hard at first but it's been done, my penis has been stroked after orgasm and the fix is in, I'm going to be forced to stay in until I can come again. Thats just one mans perspective.