down below(the genitalia, private parts of either sex: We take it in turns to stroke and massage each other anywhere but what you used to call down below (Amis, 1978) • The first time she touched him 'down there' she thought she would die of mortification (Forsyth, 1994) Taras)
where the sun don't shine(т.е. задница: Shove your advice where the sun don't shine – Засунь свои советы себе в одно место. • The man had a few extra crates of umbrellas, so I told him to stick them where the sun don't shine.4uzhoj)
short and curlies(=pubic hair) You have to obey the law all the time, not just when they've got you by the short and curlies. (from an article by Michele Berdy in TMT) VLZ_58)