The famous South African cross-dresser cum Aunty of the Nation, Evita Bezuidenhout, told this joke a while ago when asked what his/ her preferred sexual identity was. I can’t remember the exact order of the terms used, but it went something along the lines of:
On Mondays I’m heterosexual
On Tuesdays I’m bisexual
On Wednesdays I’m homosexual
On Thursdays I’m transsexual
On Fridays I’m asexual
On Saturdays I’m trisexual
And on Sundays I rest.