How to properly discuss sex with a partner?

Choose the right tone. It is likely that something in your intimacy does not suit you or annoys you. This is normal, this happens to most couples, ideal relationships, like ideal sex, simply do not happen for many years. But in order to discuss all the shortcomings of your partner (which, by the way, are shortcomings only in your eyes), it is not at all necessary to speak in raised tones. Discuss everything calmly, without presenting claims, without "attacks" and reproaches.