Not so. This is a specific situation in which they are evaluating each other for suitability for marriage. I’m that scenario, it could be considered acceptable to discuss sexual compatibility. In any case, the nature of his questions were around sexual preferences and history, not ‘perverted’ things like what colour underwear she was wearing that day or something like that. Also it’s with noting talking about sex with someone does not make you a pervert; at worst it makes you someone who is more forward than someone else and who approaches sex with a different point of view.