Akkadian
rakābu - to mount, to mate
(CAD R 83, AHw. 944)
Derived words: rikibtu ‘sexual intercourse, mounting’ (CAD R 344, AHw. 984).
Ebla
rí-ga-bu₁₆ - upper millstone
(EV 114, Kogan–Krebernik 2021b: 681)
Ugaritic
mrkbt - (light war) chariot; chariot body
(DUL 575)
Syriac
rkb - to ride; to mount; to leap upon, sexually copulate with
(LSyr. 730, SL 1466)
Arabic
rkb - to ride
(Lane 1142)
Geez
tarākaba - to have intercourse
(CDG 469)
Cf. rukābe ‘intercourse’ (CDG 469).
Amharic
rukabe - coitus, sexual intercourse
(AED 402)
Very likely a loan from Gez. rukābe ‘intercourse’ (CDG 469).
Mehri
rēkəb - to sleep with a woman
(ML 322)
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).