is it possible to tell whether a woman you are making love with has already had sex with another person within say, a day or two?

It is NOT possible to tell this AT ALL. And I get very upset when men accuse their women of infidelity because the woman's vagina feels different to them that day. Our vaginas change every day. Somedays more relaxed, some days more tense. Some days wet some days dry. As a guy if your erection has been bigger some days than others, then you understand.