To be clear, telling women that they are "not normal" is actually discouraging them from attending, not to mention being really judgemental.
Black Tie Rave AfterParty at a nightclub - how that can be a tech event? For anybody who may mistakenly think so (or wanting to turn it into), the image does perfect job of clearing that misunderstanding.
why? who decided it? and how it can realistically be done - forced ingestion of chemical castration pills by all the attendees? Wherever you have people, you'll have sexuality. May be oppressed, yet it still will be there. Only mister Data could turn his emotions chip off, and even he liked to have it on.
When people do such blanket statements without firm grounding in reason and facts, usually it is a statement of power, ie. in this context it would mean "Sexuality [of people/group i designate as such] is irrelevant ..."