You think that the danger of sex is biological and that this has been vanquished by vaccines, condoms, etc. In reality, most of the power of sex to harm is social, emotional, and psychological.

I think what diegocaleiro is saying is that these social and emotional factors are adaptations that evolved due to the biological dangers. Now that the biological dangers are mostly gone, the adaptations are unnecessary and even harmful. So inasfar as we can consciously influence the social and psychological factors, we would benefit from changing them to promote more sex.