Painful sex

Lately every time I have sex my vagina gets super irritated. I'm turned on and wet when we start but it still hurts a little going in. Then I'm fine but after like 20 minutes it'll feel really irritated and a little dry to the point where he stopped and asked if I was bleeding or anything because it was really red. We don't do a lot of foreplay, I usually give him head and then we have sex. What could be causing the irritation?