My sister was sexually assaulted. She was in a taxi at the time, in school uniform, and the perpretator was also a school pupil. She was also assualted by a friend's DD - they were no older than 6 at the time.
I was sexually assualted, during school, in the playground and during PE lessons.
A classmate was raped. She was merely walking down the main road, at 6pm, in the winter. She was thirteen and stone cold sober. DSis and I were approached by the same man, in the garden - we weren't drunk.
A friend was raped. She was sober and was raped by her father's friend.
My mum was raped. She was sober and had gone home with a chap after a party for a cup of tea.
My aunty was raped. She was sober.
I've worked with teenager girls who were raped and/or assualted. Most of the time it's a boyfriend who's forced them into having sex, a family friend or relation, a peer, or a date rape. It's unusual from experience for it to be a man attacking a drunk woman; it's vulnerability that's the factor I think but in order to not be vulnerable one would have to avoid a lot of situations not just going out drinking etc.