Is there natural medication i can take to increase quality of erections ?

L-arginine, Neo40: If you are < 40yo, l-arginine is good choice. It works like a natural viagra (sildenafil). If > 40, or if history of heart disease, look into supplement called neo40. Kinda pricy though.

Yes, many: There are various herbal supplements which are said to improve the duration and the quality of the erection; and there are many manufacturers of potency-inducing products, each with its own glossy photos of erect penises and testimonials of the men who now swear by the products. Do they work? Unless you see double-blind, placebo controlled trials (which is unlikely), there is no proof of efficacy.