Synonyms for Bonk:

n.

be intimate with someone, jump into bed with someone, spend the night with someone, consummate. stun, HIT, beat, beat up, batter. butt, cuff, chop, hammer blow, bump, blow. bonk (noun)
have intercourse, do it, have it off, bed, be intimate, whap, bash, have sex, make out, have it away, love, make love, bang, hump, lie with, get it on, jazz, eff, whop, sock, know, get laid, bop, have a go at it, sleep with.
hit (noun)
chop, whop, sock, butt, blow, cuff, bang.
sexual activity (noun)
coupling, blow job, encounter, coitus, climax, ejaculation, buggery.

v.

strike (verb)
beat, bash.

Other synonyms:

hammer blow. chop. cuff, butt. bump. blow. HIT. sexual activity
coupling, blow job, encounter, coitus, climax, ejaculation, buggery.
Other relevant words:
butt, climax, chop, HIT, bump, blow, cuff, buggery.