Or you can have crappy intercourse for 10 minutes, the girl gets bored, and fakes one..
It's quite obvious (to an experienced partner) when the female partner fakes an orgasm. It's REALLY quite obvious. I can even tell you multiple feats by which you can determine if she is/isn't enjoying the intercourse/is faking an orgasm.
When she does enjoy it/is having an orgasm:
Her nipples will get harder, pupils would get bigger (wider) and the liquid will pe produced in BIG amounts.
Severe throbbing of clitoris, similar to the throbbing of the penis during ejaculation.
Rhythmic contraction of the vagina during, squeezing of the penis during the orgasm with a frequency of 5-7 times on once per second.
Noticeably reddens the "decollete" - the area between the neck, shoulders and boobs. However, not with everyone. Starts sweating.
When she is faking it/not enjoying it:
Doesn't like touching (massages, kissing e.t.c.)
Doesn't show enthusiasm while having ***, tries to get to sleep as fast as she can.
Doesn't like topics that concern ***, disapproves of ***, condemns men.
Her vagina is dry.
Doesn't like different positions, disapproves of any innovations in ***.
Doesn't want to fall in love, can live without *** for months.
Lives with myths like: "there are no cold women...", "only a man must...", "if he loves, then he must...".
Frequently finds excuses - my head hurts, I'm tired now, it's too late, needs get up early tomorrow, kids aren't asleep, the neighbors will hear.
During intercourse, gives unexpected questions like "Why don't we whitewash our ceiling?". Even in bed, says, "I'm alright, do it normally, do it only through the vagina and quickly." Or even begins to answer the phone call, not giving shit about it or throwing it at the wall.