Almost all women are happy to use their vagina for fun. It feels good, is fit for task, self cleaning and lubricating. Most will use their mouth. Easy access, no need to be nude, no chance of pregnancy. Some don't enjoy the feeling or taste, and are unwilling to do so. Fewer still will allow access to their ass. It definitely requires more preparation, can be dirtier, and more painful; but the results speak for themselves for those who are willing to put in the time. Only a rare breed would even think of using the fourth hole though...

Perhaps you are a someone who enjoys the challenge. She feeling of being gradually stretched, and has trained for months or years and have finally gotten to the point where she can think about taking a cock in her urethra. It's also possible you are complete masochist, devoted to her master and willing to under go the challenge he has put you to. You want your master to completely own your body, and it's every hole even if you must work hard to make them accessible. Finally you could be someone cursed by biology. Either born without a vaginal canal or with one malformed, your first boyfriend found a hole and shoved it in. You knew that anal was out of the question, but that hole felt like it was around where it was supposed to be. You'd be surprised how adaptable the human body can be under the right pressures, and the first time is supposed to be painful right? Whichever way you want to go about it the roleplay or conversation should be about urethral fucking, or at least urethral play. It's not for everyone, and I expect any partner interested to be comfortable with that level of degeneracy. Either way I'd love to chat with you about it, please let me know what type of drink is your favorite to let me know you read all the way through.