Different kinds of sex raise different issues. Vaginal sex, when I take a lot of time and pay attention, no problem. There have been a few times when I was having acute horniness attacks that it was a problem. Almost all women can take a lot if they have time to adjust. Oral sex has presented a few more problems, because I like to get in deep and I've had a few women whose eyes were bigger than their mouths. On the other hand, one of my favorite partners couldn't take more than 6 inches or so, but she found ways to make it entertaining.