I(24) am from a South Asian country. I met a woman in his late 30s on reddit. She is from a nearby city. I talked to her and decided to meet her. However I am concerned mainly about two things :

1. I am someone who need emltional connection to enjoy sex, I had been to escorts twice in the past cause I was feeling very horny even after masturbating. I had sex with them. But I was not able to be fully aroused and erect when having sex. I was often distracted and lost my erection. For the first time, I thought it is performance anxiety but this happened second time as well. Now, I am again going to have sex with the woman but again I have this thing coming in my mind that I won't be able to fully erect and enjoy sex with her even though I do want to have rough sex badly. What can I do this time to enjoy it fully and not waste my time and money?

2. I didn't think about this when I went down on the two girls earlier but someone said you should not eat out women who are escorts. They have high chances of transferring you STDs. Now, the thing is I didn't get any problem when I did the deed with two girls earlier. My genitals are fine and my body too. and I didn't get any diseases from them. But I am not sure whether I should eat her out or not this time. I love going down on women. She has a bf too. Not that is a problem. But I have never done that with a married women and I am not sure whether she has any STDs or not. When I asked her, she said she hasn't gobe for STD test and so do I. But I am kinda scared. What should I do then?

3. How exactly does a dental dam is made and how exactly it should be used? I have watched many videos but I didn't understand it properly how to make and use them for oral sex?{