Question about Hogwarts' teachers (nothing at all about book 7)

[TechBear_Seattle]

Are Hogwarts teachers allowed to marry?

As I was reading book 7, it finally hit me that none of the teachers is ever mentioned as having a spouse. Some are old enough that they are perhaps widowed (McGonnigal) and others are young enough that perhaps they have not found someone yet (official canon holds that Snape was 30 or 31 at the start of the first book.) But most of the other teachers would, one would think, be married, with husbands and wives also living at Hogwarts; but there is no mention ever of a Madame Flitwick or a Mister Pomfrey. Not in The Prisoner of Azkaban, when the school is under siege, not in The Goblet of Fire during the Yule Ball, not anywhere in the events The Deathly Hallows.

What really strikes me as odd is, the teachers represent some of the brightest and most capable witches and wizards in England. I would think they, more than the general population, would be epxected to have children.

Why is this? Do Hogwarts teachers have homes outside of the school, where Mr. Sprout raises the little Sprouts and waits for his wife to visit for the two months that school is out? Do families live on school grounds but have no contact at all with students? Are the teachers vowed to celibacy? Or is this just something that Rowlings never got around to explaining, like how the Minister of Magic is selected?

What are you thoughts?