"she wasn't moving if there was hot snoggage on screen"

But you could argue that it was just a 'hur hur, look at THAT,' almost adolescent, type fascination, as opposed to a genuine sexual interest. And, unlike Owen, Tosh isn't the type to throw insults at things she finds surprising, or even upsetting. Besides which, she's essentially a scientist - not one to miss an opportunity to observe 'new and interesting' behavior in others. ;)

(But I do like the suggestion. I'd forgotten that bit.)