Yes...let's "protect the sanctity of marriage" so only heterosexuals can get married...because they have such a good track record...
Zsa Zsa Gabor - 9 Husbands
Liz Taylor - 8 Husbands
Lana Turner - 8 Husbands
Mickey Rooney - 8 Wives
Robert Evans - 7 Wives
Jerry Lee Lewis - 6 Wives
Billy Bob Thornton - 5 Wives
Joan Collins - 5 Husbands
Geena Davis - 5 Husbands
William Shatner - 4 Wives
Liza Minnelli - 4 Husbands
Britney Spears - first marriage annulled after just 55 hours
Jennifer Lopez - her first marriage was just 8 months long
Nicky Hilton - also just 8 months for her first
Shannon Doherty - 5 months for one marriage, and 9 months for another
LisaMarie Pressley - married to Nicolas Cage for 3 months and 15 days
Carmen Electra - married to Dennis Rodman for 9 days before filing for divorce.
And these are just the celebrities. There are regular people out there who've been married not even a month before splitting up, and people who've married dozens of times because they haven't found the right person yet.
If you ask me, these marriages are more destructive towards the "sanctity" of marriage than homosexual couples. I mean, the divorce rate is 43%, isn't it? That doesn't seem to be saying a whole lot for marriage.
Honestly, if straight people can ruin their lives by getting married, let gay people do it, too! Why keep all that fun for yourself??