There are a lot of threads on "fluid bonding" in case anyone is interested in a tag search.
Mono and I are fluid bonded, PN and I are not and I am not with Derby. For me it depends on the partner and the sex we have... also how important it is to them and me. To me and Mono is was very important as we like to have no-barriers-what-so-ever-sex. We like our freedom in bed and I don't think I would ever want to jeopardize how amazing that is with him. So I am careful with others... even with my husband.
It will be interesting when PN has his vasectomy soon. I don't know where we will be at after that. Its been 13 years of condoms. I would just carry on as it always has been... need some discussion around expectations I think.