Is not making gay marriage unconstitutional (question about religion & constitutionality)?

Why shouldn't Gay people get Married?Why should straight, married couples be the only ones who never have sex, argue incessantly about what to watch on TV and walk around on a daily basis harbouring a deep and bottomless well of resentment pieced together brick by murderous brick over years of real and imagined slights and emotional warfare and wallpaper choices? Hell-I say marry every gay and willing couple off right now. Mark my words-just like the rest of us- within 18 months at least half of them will come running back to court begging to be released from such an endlessly mind- and libido-numbing fate.