Erection in missionary sex or alone-Where penis joins glans from dorsal side, always more nice pleasure sensation there though rest is all hard, ok?

Ok. If you can achieve an erection that's satisfactory for sexual activity, regardless of position, and you have pleasurable sensation in your penis, then you're normal. Be sure to eat properly, exercise regularly, and avoid tobacco to help you maintain healthy erections. Work closely w/your GP to be sure rest of you stays healthy, too. Cheers!