expression, godan verb (-ku)
spread one's legs; open one's legs
Literal physical action of parting the legs, used in neutral descriptions of posture, exercise, or medical contexts.
ストレッチで股を開く運動をした。
I did an exercise spreading my legs during stretching.
Colloquial and idiomatic; used for a woman consenting to sexual intercourse. Often carries a vulgar or crude tone.
彼女は簡単に股を開くような人じゃない。
She's not the kind of person who would easily agree to have sex.