That's the first I heard of this, though it really doesn't surprise me. Kirk sleeps with every alien chick of the week and every crew member willing and the guy's a stud. If Janeway slept with every alien hunk of the week she'd be dubbed a whore. Gotta love societal double standards.
If she had quietly had a relationship with say Chakotay on Voyager I don't think that would be too inappropriate given the circumstances, but that's her decision not to. Plenty of bones for me to pick with the Janeway character to go inventing some over a nothing like this. It's her privledge to chose to or not to have a romance.