/lit/ - Literature

Can sex change a character? Should it?

My (virgin) mc is supposed to be rather autistic during the first book, but I've found the perfect scenario for him to have sex for the first time (the chapter itself would be worth it on its own).
The thing is, I don't want him to change him too much for now.
I'm not saying that "if a character has sex for the first time, they will change." I'm ASKING it: is it true? Necessary? Poetic? Stupid?

My first time, for instance, was very bland: not good, not bad, just sex. Nothing changed about me at all.
But what about from a literary point of view? Isn't sex supposed to have significance? What will the readers expect? What will they think of my mc after that?
Would it be weird if he continued being an autist after that? Not changing at all? Or should he gain some confidence? Progress/develop into manhood?

I'm worried about adding this chapter just because it would look great, but not actually fit with my mc (I take his development seriously and don't want to rush things).
But... maybe sex isn't that special and I can add this without worring too much.