well... yes!!.
Stick your finger in.
If you are refering to "Fingering" as a sexual activity then of course men can. They can "finger" a woman's vagina, a woman's anus, another man's anus or their own anus.
It means he's interested in having sex.
It's when you finger a virgin vagina or anus.
No.
well, what you do is, enter your first preferable finger into your anus. You then thrust your finger in and out of the anus, once it starts to feel pleasurable, you then slowly but surely enter your second finger; then third, fourth etc until eventually your whole fist has entered your anus. I hope this helps :)
No.
Not a good idea ...
no
You have to stick your finger in your anus
No, there are more bacteria in your anus then on that finger (as long as it's clean).
it just is very enviting