Say it with me now...discharge is normal.
Every female has discharge 24 hours a day, 7 days a week, 365 days a year. Always. Your vagina is a self-cleaning part of you, like your nose, or your ears. It is always producing discharge in order to keep itself clean and balanced. This isn't abnormal, or problematic as long as it doesn't look green, cottage-cheesish, smell bad, or itch. Additionally, when your body is aroused, things may seem wetter because your vagina is producing various amounts of fluid to help prepare for sexual activity (thus things were "wetter" during manual sex for you). All girls get this, it's completely normal, and your boyfriend isn't going to think it's weird. You can't do anything to stop it, nor should you. This is just the way your body works.
Pink Parts – Female Sexual Anatomy
"The whole world is full of morons...they just congregate on the internet cause it's easy for them to push the buttons."