Lauren,
If you like men, you should like dancing because you will find yourself in the arms of lots of men over the course of the evening. (And just about every one of them will be freshly shaved, showered, and wearing clean clothes.
Granted, some of them will not be great dancers, but you will meet them just the same.
Once you learn to dance well, you will find that no matter how many things you have to worry about, they will all vanish in the wind as it passes by your face as you float across the floor.
Even pretty severe pain can be lost in flight.
If you have ever been lonely, you will know that even if you can't have the man you want, you can always have others. (For the best three minutes they have to offer!)
All this with no strings attached, you don't have to cook for us or even do our laundry. All we will want from you is the pleasure of having a little fun together while the music plays.
As to how much exercise you will get, that depends. If you play tennis, you will find Dancing to be pretty tame. However, if you watch a lot of television, or sit in front of a computer all day, you might find dancing to be pretty taxing.
The good thing about dancing is that you won't have to force yourself to do it. You will dance because you love doing it. The exercise is just an added benefit.
One thing people often forget is that you will meet some very nice women at a dance. You will find that dancers are good friends. (And yes, if you go to a studio that stresses social dancing, the men are all nice too.)
Mike