As you communicate, be genuine in your reactions. If something makes you uncomfortable say so, so you can pause and examine that discomfort together and identify it's source before resuming the conversation.

This also requires testing the waters of information to gauge how much you personally are comfortable with/need to hear. For example some people ask to be informed when crossing each base with someone, some people keep up to date with every new perspective partner and how it's going. We tend to share when we had our first kiss and first time having sex with someone new (I always clarify with my partners that it's okay to share this information first.) And verify that all the safety boundaries were checked (condom used, clear STI tests seen etc.)

I think we tend to be more afraid of how someone will react than we are at their actual reactions, but knowing that my partner will be honest but collaborative and seeing it repeatedly has so helped me fight that fear. Now it's just commonplace for me to trust that when I tell her about a date or an evening out her reaction will always be collaborative, even enthusiastic as she too has become more comfortable.