@kristina_ks I am sending you big hugs and a salute - whilst it might be awkward to raise, sex is such an important part of life and good on you for putting your hand up with the question.
BCNA website has a good podcast (Episode 35) this topic
https://www.bcna.org.au/resource-hub/podcasts/upfront-about-breast-cancer/upfront-about-breast-cancer/episode-35-the-impact-of-breast-cancer-on-sexual-health-physical-changes-lubrication-pleasure-and-libido/ I found it necessary to ask my oncologist about hormone therapy and let her know how apprehensive I was feeling. Hormone therapy is something that I want to stay on but I wanted to better understand the ongoing impact that oestrogen suppression would have on my quality of life, and my relationship.
I hear how complex it is when you’re starting out in new relationships. The support of a prospective partner is important.
It is very difficult to navigate this on your own so the suggestion to see a sexual health counsellor might be a worthwhile support. The BCNA podcast is also worth a listen.