Yeah, if u do decide on doggy position, I usually put his dick in myself, so I know the condom is still on. Ive had someone take it off it doggy & hadn't realised til I thought "hmmm, that feel different".
Yeah like XW5 said, change condoms if the sex is lasting a fair while. Also, too much lube can cause a condom to come off inside of you & a lot of pre-cum can cause a condom to slip off inside of u. You do get used to knowing how much lube is enough & how much isn't.
I also dont trust 'Mates' condoms - Ive had loads of them split & I now stick with Pasante. Again like XW5 said, split condoms /falling off condoms scare me so I started asking ppl to cum over my tits instead & I say "I love it when a man cums on my tits" which I do & it makes me far less worried.
I usually keep checking condoms are still on by tickling their balls during sex, then with a finger I discreetly check I can feel the thick/rolled end of the condom.
Abbi xxx