eff

eff (http://definr.com/eff)

     v : have sexual intercourse with; "This student sleeps with
         everyone in her dorm"; "Adam knew Eve" (know is archaic);
         "Were you ever intimate with this man?" [syn: love, {make
         out}, make love, sleep with, get laid, have sex,
         know, do it, be intimate, have intercourse, {have
         it away}, have it off, screw, fuck, jazz, hump,
          lie with, bed, have a go at it, bang, get it on,
          bonk]