Sadly our non-pc primary school version (circa 1957) had it thus -

The Yellow Rose of Texas and The Man from Laramie,
They caught poor old Sabrina and tied her to a tree,
They lifted up her jumper - and guess what they saw?
The biggest pair of mountains from here to Singapore.

Note: 'Sabrina' aka Norma Sykes, was a voluptuous British actress of the 50s and 60s.