Wait, are you talking about animals, vegetables, or minerals? Marital aids or otherwise? Are you limiting his scope of coital rejection to just homo-sapiens, including Amish farmers and D-list reality stars? Is it quite possible an extraterrestrial would not touch him with 10' pole? The possibilities, they are endless.
I think you're overanalyzing here; Vacc is saying your dick will never enter a human vagina.