Wow, there is a lot of misinformation in this thread. Didn't you guys pay attention in sex ed?
The female pill doesn't introduce weird chemicals into the body; it is made up of oestrogen and progesterone (albeit synthetic versions). The strongest of the pills have both, the minipills only have the progesterone. And they don't work on the 'egg' - well the oestrogen bit stops it from developing, but mostly the pill affects the lining of the womb, making it impossible for the egg to lodge itself in there and making the area more hostile to 'sperm'. The steady nature of the hormones should theoretically make a girl LESS moody, but may have unwanted side effects like pimples and becoming fat. A minority of women suffer a range of weird side effects from the hormones and do not like using the pill. There are also alternatives to the daily pill, such as the tri-monthly injection or the FIVE YEARLY implanted device, which use very little of the hormone progesterone and may be good alternatives for women who struggle with the pill.
A male pill has been talked about on and off for years now. Obviously clinical trials for this one will take years, and won't be made available unless it doesn't cause infertility and such. Sounds like a great idea to me. Condoms, as someone rightly pointed out, are great against STD's but only around 80% effective aginst unwanted pregnancies. So if I were, say, a guy who liked to sleep around, I would probably take this monthly pill, and helmet up when sleeping with the randoms. It would also be great for couples who have been together a while and know they're STI free (you wanna lose the condoms pretty quick after that, they can be a romance killer sometimes). Or, in the case of a friend of mine, if you have a crazy ***** of a girlfriend who tells you she thought about putting holes in your condoms cause she wants a baby so much. (Don't worry, he left her before babies could happen)
And, for all you men out there not worried about getting wimmins pregnant cause you can just leave her, remember that if she has it, you owe her child support for 18 years. Not to mention an unpleasant knock on your door, when you're living with your new wife and your 2.4 kids - "HI DAD!"
Alright sex ed's over kids.