You have to make this sort of thing effortless (symbolic rewards lose their appeal over time). E.g, use background location or iBeacon so users are checked in w

You have to make this sort of thing effortless (symbolic rewards lose their appeal over time). E.g, use background location or iBeacon so users are checked in without having to pull out their phone. The first time they enter a club, they get prompted for permission to check them in now and any future time they're at the club. Specifying male/female should only need to happen the first time they use the app.