Well it's usually done to teen children's teen partners ime, but ok fine I hope your adult childs adult partner asks for copies for later, the age of the person making the creepy comment is really not important but I think it's worse if they're adults so I'll roll with it lol. Maybe she doesn't know her husband's proclivities, I'm not sure most pedos advertise it willingly, but he's "tooootally not gonna spank it he just wants it for archival purposes" lol.
If your wife says "not tonight I have a headache" do you ask for evidence of hypertension? If she says something you did made her upset do you ask for evidence in a peer reviewed paper on why X could possibly be psychologically damaging? I'd bet the answer is "no I take her word at face value because it is her feelings after all." But fuck the feelings of others? Would I have to begrudgingly have sex with you for you to take my word about my feelings?