Here's my "bucket list:"
-Have sloppy seconds sex with a woman after she got inseminated by either a stallion, a boar, a dog, or another man
-Have sex with a mare, repeating encounters preferably
-Have sex with a woman or mare that is currently pregnant or nursing
-Have sex with a woman (or multiple women) during an gangbang/orgy (MMF or MFM)
-Being breastfed
-Urinate on each other during sex; not on the face but on each other's laps while we're either grinding or fully into the copulation
-Being married to or entering an extended long-term relationship with a woman that can accommodate at least 1 or a combination of any of the above entries