I've never had a condom split before, then two in a couple days of each other! I've pretty much finished freaking out about it, it happened & I'll have to go and get tested, I just want to minimise the chance of it happening again!
After the 1st one, I read through some threads and decided it was down to the condom being too tight, and maybe it being from a brand called EXS instead of Pasante, which I usually use. Then today I used Pasante and it split again (different guy)
I didn't use baby oil or non-condom-safe lube, wasn't wearing a sponge, I squeezed air out of the tip...only difference I can think is that 30-40 mins of this appt were PIV sex. Do you need to put a fresh one on if it's been in use for a certain amount of time/position changes? Also I didn't put any lube on myself or the condom, could that be it?
Here's a list of what I consider to be leading contributory factors;
Brand I only use EXS for their small size, and I find smaller penis's tend not to split condoms
Not enough lube (never be afraid to apply lube, embarassment is a lot less than how you feel with a split)
Vigorous and/or continuous sex especially if it involves the bouncing porn star movement (where guy bobs in and out, pulls the condom tighter and tighter)
Not leaving loose space at the end
Oil contact
Lube and action tend to be most important factors in my experience. If you think the condom is stretching at the head, then stop and either replace or slacken it off. Many men don't realise you need the space at the end, or how certain movements put a lot of stress on the condom.
Hope this helps.