Interesting, at first I thought it was a coming out party for a sex change transvestite whatever. But OK, we will make up any reason to have a party.
But it is not 'gender' it is 'sex'. Male and female are sexes not genders, gender is related to masculine and feminine nouns. Actually German has more than masculine and feminine, I think they have neutral. But I'll get over it, they have decided to use gay instead of homosexual and gender instead of sex. Seems they don't like 'sex'.
In the good ole days you either got a Cigar or a HErSHEy bar.