Clueless straight guys with VPL? Yeah, I know several.
My favorite was my college lab partner. On the football team, square built but all muscle. Always wore white pants, just one size too small. He showed off a 4" flaccid tool, thick, cut, nice nuts. It was a LONG lab class, 3-4 hours, so there was a piss break in the middle. He'd always come back with a spot the size of a dime marking the tip of his head.
It was a year long class and the fun came later in the semester when he got the hang of the work hand he'd start thinking of sex. He would never get fully hard, but you could see he was sporting wood and he'd start flicking it with his thumb. He'd spend a lot of time doing this low-key one finger masturbation. --- I always wondered what he did right after class LOL.