The arrow of the male symbol is obviously symbolic of an erect dick.  But did you ever wonder what the circle part stands for?  It's a man hole!  Now we think every manhole cover should be properly decorated with a male symbol, as in this photo submitted by a buddy (left).  Proudly displaying the symbol of his pole and hole is Badpuppy model Tolik (right).

Manhole Cover + Tolik by Badpuppy