acostasen
Imperfect subjunctive ellos/ellas/ustedes conjugation of acostar.

acostar

Dr. Rezza, ¿sugirió a Bev Globerman o Richard McMann que se acostasen con el otro durante el intercambio de esposas?
Dr. Reza, did you suggest to Bev Globerman or Richard McMann that they should sleep with each other during this wife swap?
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skating