I can't really describe what it's like. But, the kissing is much more sensual. And we are so soft to touch and caress. And, since we know what turns us on, that transfers to knowing what turns a woman on.
Unfortunately like anything, a woman who isn't a good lover with a man probably won't be good with a woman. If she doesn't like going down on a man, odds are experimenting with a woman will be disappointing.
If the opportunity arises, take the chance. If you're curious about it, find out. Better to have tried and later say it wasn't for you than to look back in 20 years and regret not trying it.