@flo – in a vacuum, I’d agree with you. The question here is in response to Kardamom’s position here and doesn’t seem completely genuine.
But again, fair enough.
If we skip over the religious questions…
The “acceptable” forms of birth control these days are abstinence, hormonal controls for women (“the pill”, shots, implants, etc), or barrier methods, usually for men (condoms).
Any hormone treatment will come with side effects. The goal is to make those as mild as possible, but everyone reacts slightly differently. Common side effects are things like nausea, weight gain, changes to the breasts, mood changes. Less common would be things like swelling in the legs, chest pain, cardiac issues, and severe headaches. Hormonal birth control is also tied to an increase in things like cysts, cervical cancer, breast cancer, and other serious illnesses.
How comfortable does that list make you? How comfortable would you be asking someone else to take those?
Condoms are your other big option and are often offered as a no side-effect alternative. I wholly recommend having condoms and using them, but, they aren’t great for everyone. You’re basically rubbing a well lubed latex bag on some of your (and your partner’s) most sensitive parts. Some people are actually allergic, some just don’t enjoy the sensation. (yes, there are non-latex condoms, they are significantly less effective) Condoms are a wonderful way to keep from getting pregnant and stop the spread of STIs, but it’s not something that improves the experience and for some can really cause issues.
So, options in a relationship tend to be deciding whether to have one member take on a hormonal treatment or the couple make a decision to use condoms without fail. If you always plan exactly when and where you will have completely sober sex, what could go wrong, right?