Why are older women that chase younger men referred to as cougars but older men that chase after younger women?

are considered dirty old men or even pedophiles. I say pedophiles because if you only knew the number of middle aged women that hit on 16- 17 year old boys and get away with it, whereas men that do that run the risk of going to prison and being singled out by huge bodybuilder inmates that hate child molesters and getting beaten to a pulp. Sorry about the rant but all some men do all day in prison is work out all day and get HUGE, and they use their hulking size to intimidate other people and create gangs etc.