[JMTQp8lwXL]

Maybe a minor point, but I think sexual fluidity remains under-addressed by these polls. Some people are, for all intents and purposes, identifying as LGBT during, say, their college years, but then go on to settle down with an opposite-sex spouse.

If the person once identified as LGBT, but doesn't today, is it based on what they "actively" are? Or if you ever once identified as LGBT, for purposes of polling, you remain in that category for life?

[meruru]

Not a minor point at all. I think sexual fluidity is one of the most relevant aspects of sexuality and I would love to see it measured. Labels like "Gay" and "Bi" are way too simplistic.

[fuzz4lyfe]

The medical terminology is better, its often "Men who have sex with men" or something similar that removes the need to understand the subjects mental state and simply focus on the important clinical data.

[meruru]

That's better, but doesn't separate men who have sex with manly men from those who only have sex with traps. It also excludes those who don't have sex at all for one reason or another.

[masonic]

  sexual fluidity 

Based on your context, "sexual preference fluidity" would be the appropriate term.

[meruru]

What's the ambiguity here? For self-identity matters we already have the expression "gender fluidity".

[masonic]

Because sexual preference and gender identity are completely different things.

[meruru]

Yes, I've addressed that in my comment. I was wondering if there was some third aspect I wasn't considering.