RE: songs in 6/8 and tapping your foot on each and every beat.
I must disagree with the suggestion to tap on all six beats. It is more than enough to tap two times per bar on the 1 and 4.
House of the Rising Sun is 6/8.
Watch this footage between 14 and 20 seconds.
Alan Price (keyboards) gets the rhythm feel by tapping his foot six times once or twice only but as soon as he has found the groove he moves to tapping on 1 and 4 only.
The tempo is too quick to tap six times per beat. It would be physically demanding and too much unnecessary work.