To be clear, I was speaking specifically about a relationship between two women. It’s a whole different ball game when it comes to lack of orgasm in a heterosexual relationship. Because men will (almost) always achieve orgasm whereas a staggeringly small percentage of straight women do.
Recent studies show…
96% of straight men regularly achieve orgasm during sex.
89% of lesbians regularly achieve orgasm during sex.
88% of bi/gay men regularly achieve orgasm during sex.
64% of heterosexual women regularly achieve orgasm during sex.
That’s downright horrifying. So, yes, it is an entirely different discussion when it comes to orgasms and heterosexual relationships. (And, yes, you’re right – it’s largely due to the act of sex being viewed as complete when the man finishes.)