So I had sex with my boyfriend today and I wouldn’t have considered it “rough” sex but he went in deeper than he usually did, WHICH I LOVED but afterwards we usually use a towel after he cums inside me AND there was freaking blood on the towel. not a lot or anything but it was kinda embarrassing because he was like “wHy iS It REd?” Is this normal? and how do I explain it to him?!!