The second I put my penis inside her, I feel I am going to cum fast, but then it goes away... Then I have to work hard to orgasm... Is this true for other guys? I feel like an intense wave of pleasure go through me, then it subsides/plateaus... Then it actually becomes a bit of a challenge to climax after I get past that... It is like my penis gets insensitive to the feeling of intercourse after a while? Same thing for blowjobs... They feel fucking amazing in the beginning, but then my penis starts to hurt after a while.