My father is the most loving person in the world, but he had absolutely zero involvement in anything feminine about me. It almost became a joke with Mum and me when talking about lady things and trying to involve Dad. Sometimes Mum would ask in front of Dad if I needed any supplies knowing I was about to start. He would either keep his head buried in the newspaper or get up and leave the room without a word.
When Mum and I had the talk Dad was nowhere around. If Mum would mention to him that I was outgrowing my clothes Dad would not even respond. I was thrown from a four-wheeler once and he asked if I was OK. I told him I just smashed my boobs into the handlebar. He just said "you'll be ok," and left it at that.
So you can just about be certain that he would have zero interest in knowing my sexual activities other than knowing there were none. He would always tell me dates to behave, and that's about it.