Watching and recording animals mating is a perfectly normal, not at all to do with sex, thing zoologists/naturalists/nature documentarians do. Not that that makes "I spent two weeks in a hide [https://en.wikipedia.org/wiki/Bird_hide] waiting for the fwoopers to get used to my presence enough to mate in view" sound any less dodgy.

ANY finds his collection of notes on the mating habits of difference species. Fun things ensue.