I have had sex with about 20 women in the past and only a couple were girls I had even moderate emotional involvement with, so I often times have closed my eyes and pictured having sex with another girl during intercourse, making it a similar activity to when I masturbate.
I am currently in a serious relationship, and I've found that I have a harder time thinking of someone else during sex because I feel guilty about it (as I should), and at the same time also find it hard to enjoy sex itself and therefore cannot easily maintain full erection. I enjoy receiving oral sex much more, but it makes my girlfriend feel self conscious because she'd rather get me to orgasm through intercourse. I've been unemployed for a while, so I guess maybe my anxiety may have something to do with it, but over time, I've usually taken a fairly long time to get an orgasm no matter what.
Do penis rings help the issue of staying erect longer?