I can't feel pleasure from oral or handjobs, help!

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!

[hard2please]

EDIT: I'm only 19 years old.

[z726]

It could be that the amount of stimulation you give yourself while masturbating is more intense than what can be provided with oral or a handjob from someone else. You might try abstaining for a few days until you're so horny that it would take little stimulation to bring you to orgasm.

[jimpy9]

viagra would help u maintain the erection.