What Causes White Discharge After An Intercourse?

HELLO I HAVE A QUICK QUESTION. AFTER HAVING SEX MY GF HAS THIS WHITE STICKY STUFF(IS NOT A VAGINAL DISCHARGE) KEEPS COMING OUT. SHE SAIS IT MAKES HER FEEL UNCORFOTABLE ND FEELS LIKE SHES ABOUT TO PEE THAN SHE GOES TO THE RESTROOM AND THIS WHITE THING COMES OUT(SHE SAIS IT COMES OUT FROM THE SAME PLACE WHERE THE SPERM COMES) AND SHE SAIS IT FEELS SO DAMN GOOD WHEN SHE LETS IT OUT. ANYONE KNOWS ANYTHING, CAN HELP US?