Finding models willing to be photographed without cloths for free in Colombo is easier than you think. The photo in this post is the proof.
If you are open minded enough about the differences you’ll find them as easily as I did. The only lighting you’ll need is the early morning or sunset light and a bit of privacy. Thankfully most back gardens in the city tends to have high walls.
An added benefit is that models like the one in the picture below won’t fidgit or complain. Not that you would want to push them around too much.