I have an Epiphone Les Paul 100 that I really like, but the only problem is it doesn't stay in tune. What factors go into tuning stability so I can bend strings like crazy and play forever and not have to worry about the guitar going out of tune?
Lots of things

Important ones:
String itself
String tree (if you have one)

Less important ones:
Neck joint

Quote by KileManA7X
I remember my first erection. I went to my dad and was like "Do I have Aids???". I seriously thought there was something wrong with me.

tuners will make a big difference eppiphone do cut corners there normally

or buy yourself some decent strings i use to use ernie balls and they went out all the time and sucked for tone, went and got myself some nice chunky thomastiks :P