How do I (28F) get my boyfriend (33M) to stop telling my father (63M) about his sex life?

My boyfriend and my dad have been close for almost 6 years and my dad is constantly asking my boyfriend how his sex life is going. He’s okay with it because he says he just wants to make sure I’m happy. But it makes me feel so uncomfortable. I don’t want to have some sex talk with my dad, it feels weird. So how can I make this stop?<br><br>Edit:I have never mentioned anything to my dad about my sex life ever. He started asking my boyfriend when he and my boyfriend first met.