Easy way to tell your gf has had sex?

Sidsid

Male
Dec 2, 2017
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I have been feeling my girl has been cheating. I feel because of her pussy odor in some days
Also yesterday we had sex after I got home from work and she was super smooth
And we did it have sex day before
Any tell tell signs I can watch for
 
Why not just ask her? Or look at tell tale signs like

Increased or decreased Interest in sex with you
New undies or sexier ones
Unexplained lack of availability (where is she)
Increased desire to get in shape or workout more/lose weight
New ‘bruises’ in obvious places -hickies or rug burns on knees
 
Changes in cell phone behavior is a dead giveaway. As is out-of-the-blue interest in new music/movies. Increased sexual appetite or change in sexual behavior (e.g. She out of nowhere wants you to choke her or something she's never done)
 
I have been feeling my girl has been cheating. I feel because of her pussy odor in some days
Also yesterday we had sex after I got home from work and she was super smooth
And we did it have sex day before
Any tell tell signs I can watch for

Jiz dripping from her twat is pretty much a tell tell sign.