@hanspeter1234 I think it's mostly ok, if you are promoting a model, and as long as it is onsite.  Posting images offsite is most definitely frowned upon and may lead to legal action.   If you are sharing images of models from offsite, that's only ok if you have their permission and they prefer that the model join themselves.  Nude male images are only allowed in a few certain groups, and not on your profile.  For a better undestanding, you should probably ask one of the models or site moderators.

@wizard0 thanks for the explanation