HOLE GUESSING

My friend,
who is always
up for excitement
and discovering
new adventures,
and I were drinking
our usual Samuel Adams,
when he said, "Man,
do I have a surprise
for you, and me too
because I have only
recently heard about it."
What I asked, What?
"You know what a
glory hole is, right?"
Yes, I know what a
glory hole is, so what?
"Well, you know the club
over on Central, right,
the one with a big porno
screen, booths, and more?"
Well, yes. Again, so what?
"Well tonight they are having
a contest featuring 10
glory holes with 5 chicks
and 5 dudes sucking
the prizes of gentlemen."
So what?
"There is a 300 dollar prize
if you can guess which,
male or female,
is sucking your prize when
you place it in the hole
of each for 15-seconds;
you can't see the person.
You must guess 7 out of the ten."
How much is the entry fee?
"Dude, it's only 30 bucks, which
is nothing for the experience."
When we arrived there was
a crowd; paying our fee
we received a number
and waited for our turn.
As I moved from glory hole
to glory hole, I was frustrated;
It wasn't as sure-fire
as I thought it would be.
I guessed 4 right out of the 10.
I learned that night that
you can't tell the difference
between two genders' mouths,
if you can't see their bodies,
the pleasure by both is
amazingly the same.
What is the conclusion?