Taking a bath/shower or just washing in general can help a lot with the taste. Flavored lubes are a great option like you mentioned. You could also use some dental dams as well.

Honestly, if your partner is clean (showered at the very least, and I use an antibacterial wet-one as well just to avoid any possibly lingering microbe), it doesn't taste like much at all. It's NOT nearly as bad as you're probably envisioning, at least not in my opinion. I actually find the scent of anyone there, even when freshly showered, to be far more noticeable than any taste - and it's not a bad thing necessarily, just a little sweat and general nether region aromas that are healthy and normal.

Like Sam said, you could always go for a dental dam, but if you'd like closer contact and are concerned about the taste, start with a flavored lube - the Toko aroma formula ones and the System Jo flavored ones are my favorite and the Cherry flavored Anal Lube (I think it's a DJ product but not 100% sure...) are my favorites. But what inevitably happens is that I lick off all the lube and I've never been at all tempted to stop.

It does not taste bad at all if it is clean there. Just make sure to take a shower before hand and you will love the taste and feel of it all.

Totally agree with those above. A fresh shower can reduce any order or taste.