>>6228901Its because you're unused to the experience.
Humor is usually from taking something you're familiar with and adding something unexpected for a strange result.
Since you're unfamiliar with sex, naturally sex jokes go over your head because you're not familiar with the baseline of how things are supposed to go. For those of us familiar with sex, we can recognize the humor of something not going as intended and thus resulting in something funny happening because it was different than the expected result.
