可以控告公司嗎?

Working for big IT company as a conractor, an employee from the company who is a gay, always start some gay topic in front of me, even forward me some gay group mail list emails. Though I told him clearly I am not interested in those gay news, actions, he still talking a lot of the gay topics. My questions are:

1. Can I sue the company?

2. if I sue, can I win? What evidence do I need?

3. I win, what benefit will I get?

4. If sue, does it mean I can't work for the IT company anymore?

Appreciate any advice!