Well. speaking from experience, meaningless sex may be meaningless, but it ain't half bad. And it's not like "meaningless" is really a pejorative: it's like "meningless slaughter;" goodness, you wouldn't say that the slaughter was inconsequential or less slaughter-ish just because it was meaningless, now, would you?
Not that I know of this ever happening, but couldn't it be that if you place too much emotional importance on the sex, and pile too much of the relationship onto it, couldn't it turn out to be over-important, instead of the fun recreational sometimes-babymaking lark it's meant to be?
I'd rather love were more about common interests and mutual respect, and sex were more about fucking. That's always worked for me.