Guided Masturbation Audio/Video

I'm just wondering why there are thousands of guided masturbation audios/videos done by women for men, but very, very few of these done by women or men FOR women.

One of the few that I've found ... http://www.literotica.com/audio/2009/sound_2009_07/secretdreamer_session01.mp3

I just threw away some old masturbation video tapes. These were for both male and females, and if I recall the 'instructors' were female for both sexes.

But, who really wrote the 'script' anyway a male or a female? - I'd be guessing a male.

I do have somewhere some anal massage videos that were also equal in time for male and female.