When the solid has a high affinity for water - in which case it is called hydrophilic (high energy e.g. glass)- water spreads. In the opposite case of hydrophobic (low energy e.g. teflon) surfaces, water does not spread but, instead, forms at equilibrium a spherical cap resting on the substrate with a 'contact angle'.
Infections such as trichomoniasis, gonorrhea, and Chlamydia (all STDs); and yeast infection can all cause vaginal discharge. Vaginal discharge can be associated with other symptoms such as burning or itching. Antibiotics are given for infections that cause vaginal discharge.
Chlamydia is a common STD that can lead to infertility if left untreated. It clears up quickly with antibiotics. But it often goes unnoticed because symptoms are vague or absent. Chlamydia can also infect the rectum and throat. Symptoms in Men: Burning and itching at the tip of the penis, discharge, painful urination. Symptoms in Women: Vaginal itching, discharge that may have an odor, pain during sex, painful urination.