Freddie Star was accused of placing a hamster between two slices of bread & eating it.

The gerbil insertion story seems to relate more to Richard Gere, all these stories seem to originate from the Sun, the 'aliens took my Sony Walkman' tabloid.

Here's a link on gerbils & the odd places they can be found: http://www.snopes.com/risque/homosex/gerbil.asp