i always used the pill but if she can't tolerate that it isn't an option. I did at one point try an IUD (the coil) and the efficacy is supposed to be similar to the pill but I found it very uncomfortable when taking a big cock so it wasn't for me.
I believe you can get an injection which places a pellet of slow release contraceptive under the skin so that maybe an option for her - I've never tried it but it might be worth looking into.
Luckily for me I'm post menopause so it isn't something that I have to worry about now.
But condoms are no fun at all and spoil the moment totally. It's not nice sucking a condom covered cock but then having to stop while the guy puts one on to fuck is a real mood killer and anyway I want the guy to cum in me so I've always been bare by choice.
But I agree - some form of contraception is essential if she's fertile.
I've noticed lots of people (mostly guys - it would be, it's not their bodies that have to deal with the consequences!) on here who get off on the breeding fantasy but I can't say it's ever had any attraction for me whatsoever. Each to their own and I won't judge but it doesn't seem a very responsible way to bring a ...... into the world and if you play a lot you could be serially 'knocked up' and I can't see any pleasure in that.