Her just randomly having sex with a guy for no other reason than she feels like having sex is a significant stretch for her character already. The whole flirty, "my god is a god of fertility," post-coital cuddling, playfully-lick-his-face business, particularly with a total stranger is... Look, emotionally she's about as stunted as Batman. Her version of "playful" is our version of "sadistic" and only comes out when the Cheetah is in control, and the Cheetah is not interested in sex, just eating your face. Now, try to imagine Batman licking someone's face in that situation - not Brucie, mind you, but the actual real man under the cowl, since we're given no reason here to think Minerva doesn't mean it and she'd be extremely hesitant to play any kind of bluff that involved damaging her dignity anyway.