Kilgallon, Sarah J.; Simmons, Leigh W. (2005-09-22). "Image content influences men's semen quality". Biology Letters. 1 (3): 253–255. doi: 10.1098/rsbl.2005.0324. ISSN 1744-9561. PMC 1617155. PMID 17148180. Lube prevents too much friction, which causes condoms to break and irritates and tears the skin of the penis, vagina, or anus, opening you and your partner(s) up to infections. Get to know your penis Janell L. Carroll (29 January 2009). Sexuality Now: Embracing Diversity: Embracing Diversity. Cengage Learning. p.149. ISBN 978-0-495-60274-3. Masters, W. H.; Johnson, V. E. (1966). Human Sexual Response. Boston: Little, Brown and Company. ISBN 9780316549875. Goldenberg MM (1998). "Safety and efficacy of sildenafil citrate in the treatment of male erectile dysfunction". Clinical Therapeutics. 20 (6): 1033–48. doi: 10.1016/S0149-2918(98)80103-3. PMID 9916601.

Environmental chemicals. Many environmental chemicals including fertilizers, plasticizers, pesticides, and phthalates can negatively affect penile development in the fetus. This happens because they act as endocrine disruptors and inhibit the production of hormones in the fetus.For adults, the average penis size is about 2.5 to 5 inches long when flaccid (soft). And it’s about 5 to 7 inches long when erect (hard). The size of your penis when it's flaccid (soft) doesn't really have anything to do with how big it gets when it’s hard. Some penises get much bigger when they’re erect, and others stay pretty much the same size. Getting to know your penis will make it easier to spot any new or unusual changes that could indicate an underlying health condition. a b c d Gallup, G. G.; Burch, R. L. (January 1, 2004). "Semen displacement as a sperm competition strategy in humans". Evolutionary Psychology. 2: 147470490400200. doi: 10.1177/147470490400200105. Take a non-stretchable piece of string or a soft measuring tape. A string that stretches could lead to measurement errors. The hammer penis, which is long and thin with a much larger head, has all the makings for a good nailing. Wink.

a b Burch, R. L.; Gallup, G. G.; Mitchell, T. J. (2006). "Semen displacement as a sperm competition strategy: Multiple mating, self-semen displacement, and timing of in-pair copulations". Human Nature. 17 (3): 253–264. doi: 10.1007/s12110-006-1008-9. PMID 26181472. S2CID 31703430.todger - Definition, meaning & more - Collins Dictionary". Archived from the original on 7 August 2016 . Retrieved 16 January 2017. Orgasms aren’t the be-all and end-all of partnered sex, but having the upward curve provides an advantage by making it easier to stimulate the G-spot, A-spot, and prostate. Like the penis, sperm competition has caused the human testicles to evolve in size through sexual selection. [35] This means that large testicles are an example of a sexually selected adaptation. The human testicles are moderately sized when compared to other animals such as gorillas and chimpanzees, placing somewhere midway. [41] Large testicles are advantageous in sperm competition due to their ability to produce a bigger ejaculation. [42] Research has shown that a positive correlation exists between the number of sperm ejaculated and testis size. [42] Larger testes have also been shown to predict higher sperm quality, including a larger number of motile sperm and higher sperm motility. [35] Surgery. Studies of penile-enlargement surgeries show mixed results in their effectiveness, their safety, and patient satisfaction. Such surgeries, like penoplasty, can at best add slight length to a flaccid penis or slightly increase the penile girth. They don't affect the actual length of an erect penis. After undergoing surgery, you can face complications like scarring, infection, and loss of function. This is why experts consider such surgeries “highly risky". Vacuum pumps. These are often used by those with erectile dysfunction. By drawing blood into the penis, vacuum pumps make penises swell temporarily. But they have no long-lasting effect on penis length or girth. Moreover, their repeated use can prevent you from getting firm erections by damaging the elastic tissue in your penis.

The key to making the most of the curve is flipping your partner(s) around to get you closer to those pleasure spots. Pro tip: Use lots of lube, take it slow, and master the dog positions, like traditional doggy or downward-facing dog (yes, like the yoga pose), if you want to go deep and hit the G-, A-, or P-spot. Average length and girth Psychology of Men & Masculinity: “Does Size Matter? Men’s and Women’s Views on Penis Size Across the Lifespan.4"Carlson, Neil. (2013). Physiology of Behavior. Upper Saddle River, New Jersey: Pearson Education, Inc. International Journal of Andrology: “Critical androgen-sensitive periods of rat penis and clitoris development."