You're discounting how much Spamber lies. Remember all the wonderful sex she bragged about with The Thumb? Pepperidge Farms remembers.
Then the truth was revealed that they NEVER had sex at all.
Spamber is NOT a sexual being. The sheer logistics, not to mention the disgust involved, make it an impossible task. Oh, wifey might play kissy face with her and leave some hickeys, despite the grossness of sucking any of her fat folds.
Do I believe she had sex with sped Dusty? Yes, because she's a disgusting little fucker.
But whatever goes on these days is Hamber faking it to make it.