any sexual turn-off, especially a strong one which makes contraception irrelevant
Man texting: Can I come round tonight and, maybe, stay the night? I know you’re mid-month but we can be careful.

Woman replying: Yes, do come - it would be lovely to see you. But - sorry to disappoint you - I’m having my period.

Man: Argh, God! That’s so contrasexive. But I’ll come round anyway.
by Hammerklavier December 4, 2014
Get the contrasexive mug.