I definitely understand being too embarrassed to talk about sex and relationships in therapy. I felt like my T was this proper woman (my parents' age) so how could I possibly have a rational conversation about sex with her?! What if she thinks I'm pathetic or whatever. But, it was fine. I started by writing the topic in an e-mail and eventually she answered my request and brought up the topic in person. It was easier for me to have my side of the conversation already sent to her in writing (or you could hand it to her) because then I couldn't back out or start fibbing or hiding. She has her own opinions about sex that do differ from mine, and I would like to talk about sex, etc. more than we have, because there is still a lot of shame (and triggers) there that I need to work through, but one step at a time. Sometimes it feels guilty because I feel like I am using her for discussions that are only necessary due to my lack of close friends, but it's my time, right? So, try writing it to her. Write how difficult it is for you to touch this topic and ask her to open the conversation for you.