Impaired Vision

A sex therapist was doing research at the local college when one of the male volunteers told him:

- When I get it in part way, my vision blurs. And when I get it all the way in, I can't see a thing.

- Hmmm...that's an interesting optical reaction to sex - said the researcher.

- Would you mind if I had a look at it?

So the volunteer stuck out his tongue!