I have come to realize that sex is just sex---an animal instinct that humans have. It doesn't mean much in the long run. Don't get me wrong--it sure is fun, feels great, relieves stress, all those good things. But a person can have sex with anyone and pretty much get the same results.
We married very young, and frankly, our sex life wasn't that great. Eventually, after about 10 years of marriage, we decided to try having sex with other couples. We did that for a few years with a handful of other couples. And it was fun.  We had some great times with some great people. We got to try some new and interesting things.
Then it got boring.
We just gradually stopped contact with the people we had been involved with, and went back to being with each other.
I truly believe it made our relationship stronger to have had that experience.

Love, on the other hand, is precious. Love doesn't happen all at once. It grows over time, and has much less to do with sex than with emotional connection. I've had sex with men who have larger penises, who last longer, etc. etc., and I will honestly say that sex with my husband is the BEST. There is an emotional connection with him that is so deep it will never end. We most often make love, not have sex, and there is a huge difference between the two.
I don't believe that true love can happen quickly. I believe that it is born from trials and tribulations that strengthen bonds. I have seen my husband at his best and at his worst, and he the same with me. I don't love him less when his belly gets a little bigger, or he gets a new gray hair. He doesn't see me as less attractive if I put off shaving my legs for that extra day. It isn't about the outside, it's about the inside.
We have been through a million experiences together, some wonderful, some horrible, and have loved each other and supported each other through it all. We are each other's best friends.
THAT is love.
I'll take love over sex any day!