Is it ensure, insure, or assure?
To do the sex act with or to a woman; screw (1606+ and probably before)
first referred to in Gen. 45:6, where the Authorized Version has "earing," but the Revised Version "ploughing;" next in Ex. 34:21 and Deut. 21:4. The plough was originally drawn by oxen, but sometimes also by asses and by men. (See AGRICULTURE.)