One person's idea of what's sexy might just be another person's meh.
There aren't any VOY episodes that I would immediately consider as sexy. However, some episodes might contain a brief glance, angle, or costume I would consider sexy.
One of the sexiest lines when taken out of context comes from "Body and Soul"...
Seven: You became sexually aroused in my body!
Star Trek doesn't exactly have a stellar record of doing "sexy" right.
This is similar to how I often react to most of Star Trek's attempts at comedy episodes.