I guess I've always had this issue, but I've never thought much of it until I recently became sexually active with my girlfriend. I can easily reach orgasm when I masturbate, and I feel plenty of pleasure during intercourse, but when I'm receiving oral or manual stimulation, I feel almost nothing. My girlfriend gets self-conscious because she can't finish me, and I'm starting to lose the ability to maintain an erection during foreplay because I know I won't be able to finish from these forms of gratification. I'm worried something may be wrong with me. Help!