Nowadays, there seem to be a lot of men/boys who behave in my opinion, more feminine. For example saying "Oh my gosh" with a bit high voice and making gestures that mostly young woman do. Teenagers mostly call this person "gay", because stereotypes say that this behavior is mostly seen among homosexual men/boys. Not everybody who behaves like that, has to be gay. But is there any other word for this?
effeminate or effete: (of a man) having or showing characteristics regarded as typical of a woman; unmanly.
No, I'm pretty sure there isn't, for this reason:
The only thing these attributes share is that some people inappropriately (and sometimes offensively) associate them with gay people.
You can find some groupings with names - your post references some male gay stereotypes that could surely be described as "effeminate," but that wouldn't cover lots of other dopey misbegotten ideas, like that most gay men lisp, which has nothing to do with being feminine.
It's like any other group of traits people wrongly assign this way - the main thing they have in common is that some buffoons have irrationally grouped them together as pejorative associations with a group of people.
epicene: 3. effeminate; unmanly.
I find the term 'stereotypically gay' to be of use. It differs from terms like 'effeminate', 'flamboyant', 'campy', or even 'androgynous' in that it does not exclude any particular aspect that might be attributed to gay people while acknowledging that just calling certain behavior 'gay' would be silly or offensive.
Prejudice is the root of all the attitudes against gays or typical gay behaviours. Prejudicial behaviour.