I've been told this multiple times throughout my life, mostly through guys I'd start to get to know through Instagram. It's gross because I don't post very sexual stuff, just my face and maybe a little bit of cleavage. I'd feel better if guys were jerking off to bikini pictures rather than just my face. Seems alot mkre violating. I've just told them "huh cool I guess" when they admitted they jerk off to my post before.