So many different oils for so many different purposes, it can be tricky to pick the right one, nothing oil based if condoms are to be used and if this is the case then water based is a much safer bet, however, it should be noted some water based ones are not suitable if condoms are to come into play.
Furthermore, using Coconut Oil is ok but some with a nut allergy 'may' have a problem so personally I wouldn't offer a massage using coconut oil to anyone that has a nut allergy as administering an epipen to a naked form that was minutes before enjoying a massage ...well it's not the done thing.
I prefer when giving a Yoni massage to use waterbased oils such as Loovara which are mostly, tasteless, odourless and usually non staining etc, vaginas are pretty good at keeping themselves clean, oils can disturb their natural eco balance, so less oil when giving Yoni is the way forward.