For self-service sessions, only something that's reality-based works..
When I engage in a masturbatory session (I'm male, btw), my material must be realistic and preferably fact-based (e.g. related to some past action or very likely and realistically possible future one). If I'm surfing the InterWebs for visual stimuli, only girls that are REAL work. Same of movies. Artificial, and air-brushed, or unrealistically "perfect" is a deal-breaker. What works best is imagining a past action with my gf. Am I normal in this? Are ladies the same way? Or does purely unrealistic fantasy work? Guys, am I the odd one out here?