Not saying that the Danny - Megan Fox thing is true because as you say it has been debunked, but Megan Fox's first marriage has been on-and-off for years, including her filing for divorce, dismissing the divorce, and filing again.
She is hot, a sex symbol, and loaded, and people like Danny D, Johnny Sins, Kieran Lee literally have sex for a living.
Realistically, how unlikely would it be that she hired herself a pro once or twice, even if it was just for the fun of it?