Jibbali

rékəb - to ride, to mount (also with sexual connotations) (JL 211)

Also rɔ́tkəb (t-stem) ‘to jump on oa. (in play or sexual intercourse)’ (JL 211).

PS
*rkb - to ride; to (be) join(ed), connect(ed); to mount (SED I No. 60ᵥ; Kogan 2015: 457)