It's wrong to use someone just for sex.
Jason met Tina at a bar that they were both in Friday night.
Jason wants to have sex with Tina.
Jason dates Tina for a few months to get to know her before inviting her to sleep at his home.
Jason acts like he is interested in Tina in order to get her to sleep with him.
Tina starts to fall in love with Jason and eventually they get married.
When Tina finds out that Jason wasn't interested in him, she gets her brother to beat him up.