Red

You press the red button and shortly after you are on the corresponding floor.

And how am I supposed to know where I'm needed as a single male?

Your gaze falls on a display on the wall.

Maybe this will help me?

You go there and sure enough, it seems to be some sort of search engine for the rooms in this hallway.

1. Male.
2. Straight
3. Single

Those are the options you type into the display about your person. It does a quick search and gives you a few results right off the bat that you can take.

1. F50 looking for two M, preferably young.
2. M30 & F28 search for a fertile (and willing) M over 20, under 60.
3. F20 looking for three M (preferably well endowed, well built, good looking, well-groomed, six pack having, not hairy, not ...