I have a co-worker that always flirts with me and he keeps touching me like stroking my hair when he says hi. The last time we were in the break room together he told me he wanted to have a threesome with me and his girlfriend and he kept asking about my sexuality and if I was a virgin or not. He told me that he kept feeding me drinks at our Christmas party just so I would be drunk enough to sleep over at their apartment. I don't know what to do, if it was someone else I would tell them to tell him to fuck of but it's hard. He is well liked by the rest of my coworkers and I know that my boss won't care because he is scared of confrontation. I don't know what to do or who to tell.