6 Month Trial Period

Hello all!

Hope this is the right place to post.. It recently came to light between my fiancé (3 years together now) and I, that monogamy seems to be killing my libido. And we've agreed to try a 6 month open relationship - or a side bf/gf instead of multiple people. (I already have a side guy interested - and I've no worries about him searching through some women before landing on a potential side gf)

His one requirement is we come up with rules beforehand and keep communication between us open if these rules ever need to be altered, etc. My main question was, what are some good rules to have on the table with a 6 month trial period of an open relationship?

The rules I personally have set so far:

1. NO STD's - only clean partners, and regular STD testing between us
2. Birth control/condoms ALWAYS when having sex with another partner - he's had a vasectomy and I will be getting an IUD in place as to minimize/zero out any pregnancy concerns
3. Anytime we wish to go on a date or have sex with another partner, never in our own place.. always out at theirs - aka, our bed stays OUR space
4. Keeping intimate with each other at least once a week in between partners