Biual and why does she still drink with me.?

Every time I drink I get really horny. One time when I was really drunk, and I had heavy petting with my female Friend, and she let me. I remember her telling me she liked it. When I am sober we are just strictly platonic and I keep to myself. She knows I am . I try not to get too drunk because I am afraid if I do, I will try to make some advances. I don't want to let this ruin our friendship and also afraid she will tell me to stop.Please understand when you are tipsy you cannot think rationally.I dont understand why she will still have drinks with me if she knows what could happen. Do you think she wants this to happen again or am I over yzing.