Green’s Dictionary of Slang

scenery n.2

[play on SE + scene n. (3)]
(US gay)

1. sexually attractive individuals in a particular environment, e.g. the baths or a club.

[US]B. Rodgers Queens’ Vernacular 177: scenery general word for anything admired lustfully.
[US]D. Jenkins Dead Solid Perfect 146: [T]he cameraman covering the 15th hole was scanning around playfully trying to pick up Hold Its in the gallery so the fellows in the unit could enjoy the scenery.

2. anyone in whom one is interested but who does not share your sexual orientation.

[US]Gaymart.com Queer Sl. in the Gay 90s 🌐 Scenery – Anyone whom you are interested in, but is of the wrong sexual orientation. Thus you can ‘Sit back and enjoy the scenery’.

In phrases

have a lot of scenery (v.)

(US gay) to be filled with sexually available men.

[US]B. Rodgers Queens’ Vernacular 177: have a lot of scenery to be cruisy, ie packed to the roof with eligible men.