It's pain of pleasure maybe? ^^ Yeah sex every other day increases the chances and also making sure sperm is available when your egg is ready for fertilization during your monthly cycle.
Anyway, came across this awesome article, and I had a good laugh. It is some research done by male and a female medical researchers.
Ovulation is the term for the time when one of your ovaries ejects an egg, which lingers invitingly in the dark corners of your womb, smiling and beckoning at passing sperm.
Male medical researchers had consistently described fertilization in the way men have always described sexual encounters. The sperm, his smokes rolled up in his T-shirt sleeve that stretches taut over a rippling bicep, swims valiantly upstream. He knows not why. Muscling aside the weaker sperms, the slackers and the old sperms, our hero encounters the egg, who’s just lying there, thinking of England. The sperm penetrates the egg and presto, fertilization occurs!
But when a female medical researcher got her hands on the scanning electron microscope, she found something else going on right under everyone’s noses, presumably since the dawn of human evolution. The egg, far from being a passive participant in fertilization, actually sends out trailing strands of amino acids that act like fishing lures. When a strand encounters a passing sperm, it catches and reels him in. All unawares, then suddenly hooked, the sperm’s little head penetrates the crafty egg, who planned the whole thing all along.
Wow@ our eggs!