I use terms of endearment with my husband, my kids, some family members, and often with my students. But I don't use them with any adult who I'm not related to. My T is not my husband, so "sweetheart" or "honey" or "dear" would be creepy. He's not my dad and I'm not a kid, so "kiddo" or something like that would be . . . I'm not sure . . . creepy again for lack of a better word at this moment. We relate to each other as adults and pretty much as equals, so we use each others' names which seems most appropriate and comfortable.