How long can a friends with benefits relationship last?
A good rule of thumb is five weeks—just long enough to really master one another's G-spots but not so long you start to internalize their roommate's work schedule.
When should you stop being friends with benefits?
A successful friends with benefits relationship will end when the relationship is no longer serving one/both of you, or when one of you starts dating another person more seriously. You should not go into a friends with benefits relationship expecting (or hoping) for it to become something more serious.
Can guys get emotionally attached to a FWB?
This is a pretty broad question, but yes, they can. Like any romantic relationship, when you continually see someone and spend time with them it is only natural that you will start to have feelings for them.
Do friends with benefits cuddle?
Nothing is no more of an obvious sign that you are crossing the line in a FWB relationship than cuddling after sex. This is a big no-no and you must know that you can't do this in an FWB relationship. You're supposed to get yours and they're supposed to get theirs, nothing more nothing less.