Are you equating taking irrational actions with being mentally ill? By that logic, everyone is mentally ill.
> Especially in today's world which is full of easy to get sex.
What makes you think sex is easy to get in today’s world? The evidence would contradict that. https://www.psychologytoday.com/us/blog/all-about-sex/202106...
> I think every rapist is mentally not OK.
Sure, but is it an illness which can be alleviated?