How can I increase my sex drive? (slightly explicit)?

(slightly explicit - Please do not read further if you are easily offended.)

I'm 19 and I find it difficult to get turned on.

My girlfriend and I have had sex a few times, but she has to kiss me and touch me a lot in order for me to get an erection. I don't think it's ED, because I can get an erection on my own easily when I masturbate. I have never needed to use pictures, pornography or even thoughts of women or men for this purpose.

I'm attracted to both women and men, but neither have an "Oh yeah!" feeling for me like other guys describe. I've tried watching both straight and gay porn, and both are just "Oh, that's cool. Nothing special." and don't turn me on.

My girlfriend knows about this and she just says "That's not normal" and tells me to exercise more. I've tried that, and it's really not working. Are there any foods I can eat or other methods I can use to advance my sex drive?

Thanks in advance.
 
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