Lewis Short
cŭbĭto, āvi, 1
* V. freq. n. [cubo], to lie down often, to be accustomed to lie down (rare): anus hic solet cubitare,Plaut. Curc. 1, 1, 76; Cic. Cael. 15, 36: humi (pavones),Col. 8, 11 fin.: super pedes cubitantis reclinis,Tac. A. 14, 5.—Of sexual intercourse: cum aliquā (aliquo),Plaut. Curc. 1, 1, 57; id. Stich. 4, 1, 41; Quint. 8, 3, 22.
Charlton T. Lewis, Charles Short, A Latin Dictionary