The reason that women become incontinet so frequently is that they have poor muscle tone in the pubococcygeous muscle group. Period.
But luckily this is something that is easy enough to fix.
Not only will it lessen the urine-dampened panties problem, it will make your sexual experiences more enjoyable.
http://www.mwsexual.com/readingroom/...-exercises.htm
http://www.healthatoz.com/healthatoz...ncontkegel.jsp
http://www.urinary-incontinence-sexu...exercises.html
http://www.femalefirst.co.uk/relatio...-exercises.php