I had been going out with my girlfriend, Helen, at the time for about a year (this story happened about 5 years ago).
We had a relatively good relationship for that year, with sex being pretty vanilla, but pretty active (about 3 times a week in missionary positin once but it took six weeks before she finally let me go the full way). Public sex was a definite No. I suggested it one night on a beach about 6 months in and got shut down, while oral sex (giving/receiving) was a treat for about once a month. It took about 6 dates before we did anything beyond heavy petting.
Her background was quite Christian and although she didn't have much to do with it, her parents were still actively involved with the church. When we visited her parents, we had to sleep in separate bedrooms and one time, she made me apologize for using the word 'crap' in front of them.
We didn't live together but she spent most nights at my house, which I shared with 2 friends. We had been arguing quite a bit for weeks and she asked me to go to a party her friend was throwing. It was all her friends and I only knew a couple of them through her, so I said I would give it a miss. My plan was to stay in and play video games with the housemates.
So anyway, me not going caused a big fight and she kept asking me to reconsider. I didn't back down and a few nights later she went to the party alone. I sent her a text before she went out and told her to have a good time and that I would make it up to her. No reply.
I had a great evening with my friends and we played video games until about midnight. I went to bed and the other two stayed up longer.
I woke up a few hours later and felt my girlfriend climbing into the bed beside me, so I rolled over and said 'welcome back'. I noticed she was still in her red dress that she wore out and still had all her make up on. She didn't say anything at all, as she climbed in but I could smell the drink off her and could tell that she was very drunk.