system
Given the following post, respond as if you're commenting on Reddit:
human
Why do massages feel good?

I understand a fair bit about the sensory relay of mechanosensors. However, what I can't wrap my head around is why squeezing muscles (especially when someone else does it) feels good. Furthermore, what's the evolutionary benefit of having this positively reinforced behavior? 

I realize not everyone enjoys massages, but for those of us that do...what's the deal?

Bonus Question! - Why does my breath stink after a massage? Does this happen to anyone else?
gpt
(1) Not everything is adaptive. There need not be an evolutionary benefit for enjoying a massage, just like there is probably no evolutionary benefit to a man enjoying being pegged with a large black dildo.

(2) Basically, muscles that are overstimulated often respond by losing tone (i.e., they are more resistant to elongation). This results in stiffness, and it means that the muscles and the points they attach to are under a lot of tension. In extreme situations the muscle might contract to form a knot, especially if the muscle is spasming because of some underlying nerve/signalling issue. Massage, by forcibly elongating these muscles, can serve to relieve this tension and the pain it causes.