He says he likes oral sex and asks for it sometimes, but when I do it to him he begins to laugh and smile and not seem to enjoy it sexually like I expect him to. I just pull away usually and stop because he makes me feel like I am crap at giving head or something.

Today I asked why he does this and he said it was because he feels like I am judging his penis or I think its small or there's something wrong with it etc. and it is always in the back of his mind.

I feel like this isn't the reason and that it is an excuse because why would he laugh because of that!

I feel like this isn't the reason and that it is an excuse because why would he laugh because of that!?

How does he handle other situations where he feels embarrassed?

For many people, laughter is a defense mechanism. If he laughs, then what he is imaging can't hurt him.

It sounds like he is a bit uncomfortable about his body image (penis size). Do you know if he has had a bad experience in the past or if he is trying to work through mental issues regarding your past (real or imagined)?

I would think if he were going to lie about why he is laughing, the old 'you're tickling' would work better.

Talk with him when you aren't engaged in sexual acts or trying to get that way. Let him know that his laughing is bringing up concerns in your mind. Let him know you don't quite buy his explanation and need a better understanding of where he is coming from because you aren't judging him in any way (especially if you aren't).

Your boyfriend sounds very insecure about his manhood, and maybe a little immature when it comes to sex. He needs to grow up a little. If two people have a healthy sex life, it's usually because they learn to please each other, not laugh at each other. That involves healthy communication during sexual activities. If you are doing something wrong in your technique, then he needs to be a little more sensitive to your feelings, and not make you feel like your "not good at giving head". Guiding each other makes for a much healthier and satisfying sex life. And that is best done by talking to each other during sex, and asking what and what not feels good.