to sum my points up:
0.
Avoiding behavior may outperform reproductive instinctincs.
Proofs: many animals don't mate in zoos. Especially pandas.
Labelling all of them "lgbt" is not the case.
1. lgbt abbreviation itself is a recycled "igbt" (insulated gayte bipolar transistor)
6-colored flag is also recycled, speaking of ins-g-b-transistors.
Transistors and resistors in general have 10-stripe flag for various resistance *nominals*.
6-stripe flag without sky blue is a possible joke on radio nerds using 10-stripe flag instead of digits for tiny radio parts.
2. IIRC
word "gay" comes from prison speak, without its "outside the prison" pre-WWII meaning.
Apparently, it's a portmaneau, somewhere between "gal" and "guy".
TO SUM IT UP
It's a hekking prison joke made to mock radio engineers.