But the m4m market could be the most lucrative. Look at... that senator whose name I forget. Wouldn't it be much easier to solicit random sex via your phone than try to do it in a cubicle? And heck, it's probably a lot more pleasant for everyone who has to use those cubicles.

Of course in order to make this happen you'd probably need to build a general-purpose "meet people with common interests" app, just to provide some plausible deniability (either to others, or to one's own self). "Oh no, that's not a random gay sex app, I just like to meet other... model railroad enthusiasts..."

One more thing: by the time you've done all this, there's no point in restricting it to airports, is there?

This app exists and is hugely successful. It works in Airports, Office Buildings, Government Buildings, inside the Court House...

called "GRINDR".

Local prostitutes will be all over that.