erection but no orgasm

Dr., my boyfriend gets and erection for intercourse but usually is unable to achieve orgasm no matter how long we go for.  He says it happens when he is in a new relationship, but we have been together 3 months and he is still having this problem and I would like to understand why this happens and am also unsure how to broach this with him! I have asked him if there is anything I can do differently and he said no

[Roger Gould, M.D.]

I would suggest that you don't bother asking him any of these questions, or even try to figure out why.  It is something he has to figure out, and he is probably right, that if the relationship goes well, it will take care of itself. Enjoy the relationship, and enjoy the sex, and just let nature takes its course.