I realize that GLB people can remain celibate while in Egypt and they are likely to be fine. The fact that they may be safer pretending to be something they are not is a bit disconcerting, but that is not my primary concern.
Celibacy isn't required, they just need to avoid overt "public displays of affection". (And it might be wise to avoid requesting a double hotel room...) It's not really that different to women wearing a headscarf when going to look around a mosque - whether you agree with other people's beliefs or not, you go along with them when in their country/building.
My primary concern is the safety of potential transgendered and transsexual conference attendees.
And what are the grounds for this concern? I haven't seen an answer to that question yet.