Sixth Sense — Lynne Connolly

At first, all they can do is look at each other. Then they agree to take a journey together, exploring each sense, one by one...

Jim is a computer genius; Poppy works at a bank. Under normal circumstances they'd never have met, but a pair of unforeseen disasters pushes them together. By agreement, they torture each other with one sense at a time, and when they finally get together, nothing can stop the combustive passion that burns them through the night.

But a shadow from Poppy's past threatens her life, and if Jim can't break the ingrained habits of a lifetime, he will lose her. And if Poppy doesn't reassess her life, Jim could leave it before they learn what they really have.

Sight, sound, scent, touch, taste--so what's the sixth? They won't find out until they get there.