Demurely telling your new gal's dad, "That's fine --- I'm
bi" may indeed be sarcastically amusing by implying dat you would actually ENJOY having said paternal dude make you "take it up da
bum", but said remark could also "backfire" (pun not intended, but it works well here!), especially if dat family is of the
conservative-minded variety... even if they don't truly believe dat you actually meant it, they may still be highly offended at da flippant "either/or" sexual reference, and so the girl may no longer wish to date you, and her
parents may not want their precious Miss Vulnerable to be hanging around with "some foul-mouthed/coarse-minded dude" like you.