No condoms during sex cause smell?

I usually have no problems in the smell area but now that I'm in a serious relationship my boyfriend and I don't use condoms and I've noticed a weird smell after sex and even after a shower... And I use summers <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>.. I just had a check up there were no abnormalities.. Is this common?