Apparently, Nefcy sez she's a virgin.
I disbelieve. Tom's a DEMON PRINCE, and Star is desperate not to be queen.
Do the math, she probably only dated him to try and get out of being Queen, and let him defile her every way he wanted, just to make sure.
I mean, come on, she was prepping to murder a mermaid before Marco stopped her. You think she'd have stopped Tom just because he wanted to do...'stuff' to her?
Sadly for her, Eclipsa already did it bigger and better, and she still had to be queen, so she dumped him like dirty laundry.