Hello 13cm length of penis is more than sufficient to got pleasure while intercourse. Do foreplay with your partner before intercourse it's helps to hard erection and long lost. If you need further help come to practo direct.

An average penis size of 8.8 cm (3.5 inches) when flaccid, An average penis size of 12.9 cm (5.1 inches) when erect is seen as normal. Male concern about whether penile size lives up to the desires of females seems to be largely misplaced and unfounded worries about inadequacy are not helped by the fact that a man's own view of his penis automatically makes it look smaller to him than to someone else. Looking down at the penis from above makes it appear smaller, compared with how it looks straight on, or from the side. So you have a slightly above average size so you don't have to worry about the size.

There is no medi (tab， cap， powder，oil，pumps，rings) in the world could increase length & girth (motai) of penis. Even if spending lacs of Rupees. Size of penis is not imp. For satisfctry sexual relationships. For this one should hv a good firm，hardness in penis & should tk sufficient time bfor discharge. Hv good sleep，do exercise & yoga daily 1 hr. Tk hot milk 1 glass mor & eve Tk tab. Manmath Ras & Pushp dhanva Ras one tab. Each mor & eve for 3 months. See the results orelse consult a sexologist personally.

Nothing to worry. Actually 3 inches during flaccid and 5-6.5 inches during erections is the average penis size. So you have it

U r absolutely normal. No need to go for mensturbation, before sexual intercourse.