It's really recommended that you use a lubricant with condoms, you can by lubricated condoms or buy extra lubricant. If you don't use lubricant or buy lubricated condoms, the chances of the condom breaking is increased due to the friction during sex. Often times just natural lubrication from the woman isn't enough, and many couples need to use additional lubrication to make sexual intercourse go smoothly.
I also just found this article from scarleteen on condom use... here's what it says in regards to condoms and lubrication...
quote: Condoms have a high rate of success, but that rate drops when they aren't used properly, and one of the easiest ways to break a condom is by letting it get dried out. Buy some lubricant when you buy condoms. Not only will it help them work better, well-lubricated sex is generally more enjoyable sex for both you and your partner. Even if a woman is plenty wet on her own, out own lubrication doesn't tend to work as well with condoms as the stuff made for condom use does. Even when a condom is already lubricated, it's a pretty stingy amount of lube. Do NOT use butter, oil, body lotion, Vaseline or ANY lubricant other than lubricants intended for use with condoms. If you could buy it in an aisle in the store where food also is, it isn't the right kind of lube
You can take a look at this article here: Condom Use
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