I'm just going to go out on a limb and say that if you really feel you need to have "one last night of fun" before you get married, you need to sit down and think about whether marriage is something you really want to commit to.
OTOH, I also think that for most people, the Vegassy/super transgressive bachelor/ette party is probably just "last fun" in quotes, and also an incentive to be grateful that those days are over in their lives.
Neither I nor Astronaut had such a party. Not our particular brand of smokes.
But if it is yours, internet people, then more power to ya and hope the marriage is as fun as the b-party. Or more, really. And anyway, who cares about other people's choices?
The other thing I'll say is that saying "X degrades marriage" is a too-broad brush. Because if you're saying "bachelor parties degrade marriage," well, there are plenty of examples of strong marriages that followed some serious debauchery a few nights before (and some that include debauchery in them, with other people. I'm talking swingers! They exist!). You may as well say "Gay marriage degrades the institution of marriage." Nobody's gay marriage is inflicting itself on mine. You can say "Divorce degrades marriage," which is literally true, but of course, what led to the divorce?
According to Stephanie Coontz, the ultimate destroyer of marriage is love. Now that we have to be in love relationships instead of family-arranged or approved businessy marriages, when love fades (as it will) or when something that is mistaken for love is the basis of a marriage, or when people change, the marriage is at risk.
Pretty radical thesis. Obviously it appeals to me. But so do such straw men arguments as, "Lutefisk degrades marriage," "empty toilet paper rolls degrade marriage" and "Biking degrades marriage." Because they're about as honest as "stripper parties degrade marriage."