Well, there's bike porn and then there's bike erotica... LOL. Really though, you'll get a stable eventually, beater bike, city bike, road bike, BMX beast, hardtail cross country bike, all sprung downhill monster, cyclocross bike, recumbent, beam recumbent (sled o' death ).
Actually, all these bikes have very different uses and depending on your terrain you may not need a whole stable of mountain bikes; Here you just need one really good hardtail. The beater (junk) bike is for running errands 'cause nobody will steal it. A road bike to go on those training rides and check out guys in spa- no, no, road work is good aerobic training to support the dirt adventures! That's right. Recumbents are just plain fun and take the strain off the back, that BMX cruiser (child of the Schwinn Krate) is for wreaking havoc while scooting around university campuses. Frat boys dig 40 year old women who can ride the stairs, did you all know that? And the Cyclocross bike is monster fun in a mud pit, and I bet they rock for winter commuting!
Then these all come in tandems. No boredom here!

Lizzy