High heat (like keeping them in your wallet or in the glovebox of your car) will weaken condoms. If you and your girlfriend are going to have sex in the car, buy fresh rubbers from a store--not a machine somewhere--on the drive to the place you're going to do it. That way you know they're good.
No, condoms are not effective if they go through the laundry. The heat from the washer and dryer will weaken the rubber of the condom. Even non-latex condoms cannot withstand washing.
Petroleum jelly (Vaseline) itself is safe, but it will weaken latex condoms.
To weaken elastic so it is not so tight is by heating it with an iron. Stretch the elastic as you apply heat and leave it stretched until it cools. You may have to apply heat more than once.
heat suckas
It can heat it enough to weaken it, but it won't melt it.
the lack of vital conditions like water and heat
No it doesn't, but a magnetic attraction weakens in heat, or if a magnet is hit hard on any surface
Yes it is. Too much heat will eventualy weaken hair shafts and folicles and cause them to fall off.
That, and when they contact land.
Rubber condoms are thick so sensation for the man wearing it is dulled. They also block heat flow, which is apparently an important stimulator for the penis. They have the advantage of slowing male orgasm which is good for the partner. More expensive non-latex condoms are thinner, transmit heat better and can be used with all kinds of lubricants. And of course, are much more expensive.
most likely an allergic reaction
The energy supplied during latent heat is used to break/weaken intermolecular bonds and NOT to increase the kinetic energy of the molecules.