sexually active period, mating season, estrus, estrum, rut

time; period / to expect; to look forward to

enter

ethology

action; behavior

to act

sexual arousal

to be in heat / to feel frisky

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