There are several kinds of boys in this world: those who have masturbated to their sister’s panties, those who say they haven’t but are lying about it, those without sisters, and those who are sexually dead. I am a member of the rather large first kind.
I grew up in the 1950’s we didn’t have internet then. As a young pre-teen, the best I could do was the girl’s section of mom’s Sears Catalogue and at least they showed pictures of women and girls in their undergarments. I didn’t have a lot of time alone