there are only 5 minutes!

The couple outings zoo.
When I passed the tiger cages, guides say:
"Ladies and gentlemen, the tiger is a powerful beast, we can have sex for 45 minutes."
She immediately turned to the husband and wife:
- You see, 45 minutes there!
To lion cages, guides say:
- Lion is also equally well, they mate over 30 minutes.
She pinches her husband:
- That ... on 30 minutes fraud!
Horizontal deer cage, guides say:
- As a deer is only 5 minutes.
The husband immediately looked to his wife:
- You see, there are only 5 minutes!
Wife instant big bully:
- So the new deer cuckold!