Once a girl invites a guy for sex, it means she already wants to. So why should a guy "struggle to make it"? Here and it turns out that the guy was right, who recently wrote here that girls consider sex an unreasonable favor on their part.
and...
Wow, invited such, you came, she split up, and it smells of her, or a rash of unclear genesis, or something else repulsive. Will you jump on her anyway? Did he want? As much as he wants, he will want to do if you do something that seems disgusting or dangerous to the girl.