I couldn't possibly comment on Betty's blokes habits of being horny when the team he bet on in the bookies wins. Or about his habit of shouting repeatedly the name of the winning team whilst doing the deed.
Betty says its sticks like an earworm right through pregnancy to birth. At which point she's too bloody knackered to think of anything else for the registrar to write down.
ETA Betty not Brenda, that's a whole different branch of the family tree