Companies offer many types of nonsurgical penis-enlargement treatments, and often promote them with serious-looking advertisements that include endorsements from "scientific" researchers. Advertisers would have you believe that your partner cares deeply about penis size. Alpha Xtra Boost Reviews The length of a non-erect penis doesn't consistently predict length when the penis is erect. If your penis is about 13 cm or longer when erect, it's of normal size. Alpha Xtra Boost Men suffering from Peyronie’s disease often avoid discussing it with their doctor, have depression, anxiety and marital difficulties. Erectile dysfunction is simply the inability to obtain and/or maintain satisfactory erection adequate for sexual intercourse.