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You can check out this video for a more in-depth guide on how to choose the best lubricant for you:
Unlike the vagina, the anus is NOT self-lubricating.
Just make sure you have some form of lubricant to use!
Anal fingering stimulates a girl mentally and emotionally.
Now, with fingering her ass you MUST make sure you have some good lube available.
Try licking, sucking, kissing, etc.
You can always try next time.
Water-based, silicone-based, and even natural oils such as grapeseed and olive oil are fine.
Bringing up anal fingering and similar things to your girl, and then of course trying it can be a great way to improve your relationship.