I am a 20 year old male and have been having sex for about 3 years now. For my first 2 partners I have not had this problem and when me and my current partner first started having sex I never had this problem. It has just occurred a few months ago. It seems as though I can stay erect during oral sex but not intercourse. It is not that I am not turned on because I can feel myself almost climaxing, but I am just not fully erect. The pleasure is there and I am definetly not turned off at all. Maybe I get bored? We try new stuff and that seems to help a little, but its hard to be creative. Also when I masturbate I'm not usually fully erect either. Is this a problem? Thank you.