Seriously speaking, why would you want to know when a lady just had sex?
For clarity sake some say when a lady just had sex, the way she walks changes, she becomes happier, she smiles more often, she becomes more vibrant. I beg to differ because a lady in love could exhibit such traits or a lady that just got proposed to or simply a happy lady.
If you really want to see a lady change her walking steps, become happier, smile more often, become more vibrant. Ask for her account number and wire in good money.
Don’t be deceived, you can’t for sure know when a lady just had sex and its not even your business sef.