sex problems

So I think I have a problem, I have sex and do foreplay with my boyfriend and I get so wet that when we are having SEX his penis literally slips out of my vagina a lot of times and the it hurts him. And when we do oral i get so wet that all the wetness gets all over my thighs and down my buttcheeks and it's so terrible because it's TO WET like I get guys like when it's wet but it's like way to much and it feels really weird during SEX because it's that wet and idk what to do about it. Because I don't know why this happens