Danny Guselli laughs as International Men's Day and Toilet Day fall on the same day saying that can't be a coincidence.

I’ve never really questioned why men spend so much time on the toilet. When I was a kid, almost every bathroom I went into had a roll of toilet paper to one side and a stack of magazines on the other.

It's a familiar puzzle that many of us face on an almost daily basis. When nature calls and your only option is a public toilet, which cubicle should you pick? Thankfully, science now has the answer ...