Monogamy can also be considered a source of risk depending on circumstances.
People who want to have lots of sex, will still feel those desires in a monogamous relationship. Monogamy might make them less likely to act on those feelings, but it will make them less likely to test regularly, and stop them from being open with their partners about risks, and prevents clear communication about establishing safe sex practices.
If my partner has sex with someone else, I want them to feel safe enough to tell me. That way I can make decisions such as using protection with them that I might not otherwise, or getting tested myself, which I would not be able to otherwise.
People who want to have lots of sex, will still feel those desires in a monogamous relationship. Monogamy might make them less likely to act on those feelings, but it will make them less likely to test regularly, and stop them from being open with their partners about risks, and prevents clear communication about establishing safe sex practices.
If my partner has sex with someone else, I want them to feel safe enough to tell me. That way I can make decisions such as using protection with them that I might not otherwise, or getting tested myself, which I would not be able to otherwise.