My girlfriend liked the position where she had the guy pressed on his back with his legs raised so she could straddle his belly and hold him down while she watched the guy fucking his ass Jacking him off at the same time, depriving him of any type of intercourse. My girlfriend was an exhibitionist and also a voyeur and loved, sucking me off so that the stud in our three-way could fuck my ass good without me bitching about having sex.
It's true what you say, that the expressions may be fake, but those who pursue a career in porn still enjoy doing certain things, this actress is called "huntsman" and if you see many of her videos they are with relationships with bisexual men. So I think yes, she loves having sex with bisexual men (there are many women who like it and they are not porn actresses) and this shows in her expressions.