I couldn't disagree more with the above and I've been happily married for a long time now. Friendship is highly overrated in marriage, and sexual chemistry is grossly undervalued. Interestingly enough, I recently read something similar (to my comments) by James Dobson of all people.
And I completely disagree with what you're saying, and I've also been happily married for a fairly long time. (A long time = 2 Rush Limbaugh divorces.)
"Sexual chemistry" is worthless garbage if your spouse is a nasty, evil, vindictive, amoral person. On the other hand, it's relatively easy to find a kind, loving, thoughtful person tremendously attractive, sexually and every other way.