a back gate / (figuratively) the anus, as a homophone for 肛門 and in contrast to 前門 (zenmon, “front gate”, figurative for vagina)

steal in, sneak in

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

a gate / (religion) a sect, school of thought / (biology) a phylum, division / Short for 門限 (mongen): a curfew

school (institution dedicated to teaching and learning)

counter for cannons or large guns

doorway, exit and entrance / teaching institution / clan, family, kin / set of academic doctrines / Used in Sanskrit transliterations

a gate, portal / an entrance, gateway, opening / a clan, family, kin