[Coffee.]

QUESTION 1: You'd be fine, most sperm dies when it hits the air anyway, so don't worry about it.

QUESTION 2: No, and what I mean by that is that you can't use it as a spermicide on a condom or something. By washing your hands, look at answer #1, you'd be fine.

QUESTION 3: CHANCE? Possibly. Likelihood? No.

QUESTION 4: Once again, this gets technical, like "Every single sperm" out of the millions? Probably not, but enough to be safe? Of course.

Also, the best thing to do is just use a condom. No worries at all.