One thing I like to ask people is if they can name me an openly straight female pornstar. That is, a female porn star that has never appeared in scenes where they have sex with both men and women and have stated or it can be inferred from a long enough career that they refuse to be booked for those scenes. Then I ask them if they can name me an openly bisexual male porn star That is, one that has opened appeared in scenes where they have sex with both men and women.
The disparity of how hard it is to name either category reflects back onto our social beliefs of the acceptability and commonness of each.
How does one draw any conclusions from things fluctuating as much?
Not to mention that there is a whole masculinity-hinged-on-heterosexuality thread which seems backed by... wishful thinking?