Why does my penis bend/buckle at base when erect?

Bend in penis: You could have a condition called Peyronie's disease that causes abnormal curvature of the penis when erect. If the erection is of good quality, you and your partner do not experience pain during sex, it's best observed. For severe cases a new medicine is available to inject into the scar tissue causing the bend. Btw, no one is perfectly straight from what I've read