Guys prefer the natural feel.
Girls prefer the natural feel.
I believe I can speak for 95% of the authors who often don't bother to address birth control in their stories that it is a more enjoyable read to think that we can have uninhibited sex without the consequences of pregnancy. I'd love not to have to take BC pills in RL but if I don't then I'll get pregnant.
I say, immerse yourself in the fantasy of sex with pure freedom. However if you're into pregnancy then there's the author who's written 200 stories about getting his niece pregnant.
For the rest of us I say what I said to one emailer who asked about pregnancy in my story:
Repeat to yourself, "It's just a story, I should really just relax."
Desiree