Mostly fantasies or porn. Sometimes I won't think about anything (this is usually when I masturbate before bed or when I have been masturbating way to much
). On a special occasion I'll masturbate to erotic stories and every so often I'll masturbate while looking at a non-erotic photo (just like a normal picture of a guy I am crushing on). I like to switch it up cause I masturbate a lot and things tend to get semi boring easily.