“Does sex or masturbation increase the size of the penis?”
Sex or masturbation does not increase the size of your penis. Your maximum penis size is determined by your DNA.
Practice Practice Practice! Masturbation will help you actually achieve the full potential size of your erection. If you are less pressured and feel more at ease to enjoy your time either by yourself or with a partner you will be able to reach and maintain your full erection size. Sometimes pressure to perform sexually keeps you from reaching your maximum erection size.
How do you make your penis bigger? How do you get your penis to reach the full erection that was intended for you or your partner in this lifetime? Do not put weights or suction devices on your dick other then a nice wet mouth. My personal suggestions when with a partner is to revert to a good ol’ fashioned blow job (giving head aka oral sex) and the other that is great is prostate stimulation while giving your partner head or a hand job. Not all guys are a big fan of anything in their ass. Such a shame 
Do not fall for scams or ads in the back of magazines or magic pills to make your dick bigger. I’ve mentioned before to not alter your dick size if it is not really necessary. Please don’t forget that you should get check ups by a real doctor because other conditions like diabetes, heart disease, or medications could get in the way of your erection potential.
Kisses,
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