Not being defensive, but explicatory...

By 'unhealthy' I was referring to a few friends of mine's insistence on never looking beyond a small (very small) group of friends and locations, and almost violently rejecting anything that might make them expand this circle. It's more than just sexual orientation... I know people from a couple of social groups like that. Sadly, the longer they stay stagnant, the less they stay friends. Variety is the spice of life, and these people are living the life of pablum.

M