What are the best Recommendation for better erection?

So me and my friend had sex kase today and honestly my performance is very poor like ang bilis lumiit ng manoy pero nag enjoy padin sya although bitin talaga ako kase I'm sure dipa yun ang pinaka erect ng penis ko so i just wanna ask does robust actually work or if not is there some pills na i can take to prolong my erection and pano yung pag take nya like may mga bawal ba ganto ganyan thanks sa maghehelp po!! Btw im an M19