Days are shorter in winter, and chances are, at some point you are going to have to shoot in low light. It can be a little overwhelming if you are not used to it but I promise it's not as scary as it seems. Personally, I love switching up the lighting every now and then because it gets your creativity flowing and clients love the variety. Moody images are particular popular in boudoir due to the sensual feeling they provide. Plus, if you learn lighting right, you can use it to your advantage and hide parts of a clients body she may not want showing and accentuate those curves she truly loves.
(moody shots are AMAZING for tushie shots!)
You want to make sure that you maximize the light hitting your sensor so opening up your aperture is always a good way to make sure that happens. Take some time playing around with your settings to see what you like and what you don't like. In order to keep your images sharp, you can play around with the ISO settings as well. You may be afraid to add a little grain to your photos, but I find it actually just adds to the sultry feel of these images! Blurry images can be super sexy too. So many possibilities with low light really!
Lowering your shutter speed will definitely help you get more light into your photos, as it will keep your shutter open longer. This can get tricky sometimes because if you are a little shaky while holding the camera it can throw everything off. Use a tripod to steady your camera and play around with your shutter settings. Don't be afraid to lower it down!
I shoot moody images with natural sun light. I do these shots at any time during the day, as long as sun light is still available. Once the sun sets, there will not be much shadow to light play and images can end up looking a little more flat. The stronger the light coming in, the stronger the contrast will be, as seen below:
Don't be afraid to play around with the lighting. You may just find yourself preferring low light sessions more!