knee genitalia 4 realizations
ACCEPTED Realization 1
type Polysemy
language Akkadian
lexeme birku
meaning 1 knee našpak birki u aḫi mariṣ
he suffers from limpness of knees and arms
direction
meaning 2 (an euphemism for male and female sexual parts) eṭlu dunnamû ša lā išû birkī
a man of low standing, who is impotent (lit. who has no knees)
reference CAD: b 255
comment
ACCEPTED Realization 2
type Polysemy
language English
lexeme lap
meaning 1 knees
direction
meaning 2 loins; genitalia
reference <personally collected data>
comment

Not exactly the same just as 'knee', but more 'loins'. Meanwhile, in the modern language the meaning of this word have much more sexual connotations.

ACCEPTED Realization 3
type Polysemy
language German
lexeme Schoß
meaning 1 knees, loins
direction
meaning 2 feminine genitalia
reference <personally collected data>
comment
ACCEPTED Realization 4
type Semantic evolution
language Polish
lexeme łono
meaning 1 lap, knees, breast
direction
meaning 2 genitalia (obs.)
reference
comment Фасмер 517. Нужно проверить польский, я не уверена, правильно ли поняла. МБ.