Let's see... at first depending on what you're searching, you must know that guys are interested (or become interested) in most girls that are interested in them, provided you're not scary looking and/or batshit insane.

Secondly, hints: guys that aren't straightforward will do stuff such as look after you, spend time with you, do stuff with you they wouldn't care to do otherwise, so stuff with you they wouldn't do with other people.