There are two sets of lips: the labia majora or outer lips and the labia menora, the smaller inside ones. Normally these seal us up real well and do not allow entry of water into our vaginas. If spread apart, water will enter with the attendant problems of pool chemicals, lake bacteria or whatever. Not a good idea.

In any case, a bare penis in a vagina is there to deliver semen with its load of sperm and pregnancy is just as likely in water or out. We just do not feel the semmen dribbling down our cracks.

Yes, I have done it in water. Novel but not really fun. And a very bad idea.

i agree with demonbuttercup that you should not do it in water. its full of bacteria at the lakes so you don't want to catch something

also sperm i heard does not die in water or air.

yeah
being a chick i personally wouldn't want any weird micro-organisms or weird bacteria forced inside my vagina.
stick to dry land.

Sperm does NOT die when in contact with water. Please remember that, also make sure your friends know it. I'm shocked that you would have thought this. Clearly sex ed has failed somewhere along the lines.

Sex in a lake is as safe as you make it. Being in a lake is never safe as it is, as you dont know what is in there, and you may get your foot trapped and drown, but i'm sure thats now whats on your mind right now.
As with having sex in any kind of water, make sure you use a condom.

Yikes! You may be in for a surprise if you've been using the pool.

What you're probably thinking of is that it's been reported that body temperature (i.e, a warm bath) can affect sperm count. I think it raises it, though.

Having given a serious reply, I'm compelled to add that the safety factor is probably directly related to the temperature of the lake... is she shivering or estatic?!

um.....hun...sex is never safe without protection! r u on birth control or anything?