The decrease in your hormones, for example, estrogen, may affect the vaginal environment. While some women have no problem in this area, others do. You may find that sex is painful due to the dryness you are experiencing.
There are several products for vaginal dryness, for example, water-based lubricants, moisturizers and creams; you may purchase some of these over the counter at your neighborhood pharmacy or at health foods store, or again, discuss with your doctor to get something prescribed. Also, make sure that you are drinking sufficient water on a daily basis; you want to stay hydrated. During sexual activity, encourage your partner to engage in sufficient foreplay before actual penetration as this may also help to lubricate the area.