Composite graphic of a cartoon cactus wilting over, surrounded by exclamation marks
We bet they didn’t teach you you’re erection is 30% longer than you can see (Picture: Getty)

School biology lessons can sometimes be a case of a teacher trying to impart the basic facts about sex to a group of giggly teenagers.

And while the trusty basics are a great place to start, there is so much more about penises and erections that we bet they didn’t teach you.

Our sexual health is something we should be all clued up about and our favourite Instagram doctor, Dr Danae Maragouthakis, knows all there is to know about genitals.

We’ve already covered penis misconceptions, now it’s the time for the hard facts…

There are three types of erection

If you get an erection you may not think much about how you actually became aroused.

But when your penis gets hard, according to Dr Maragouthakis, there are actually three different categories of erection it can fall into.

A man peeling a banana in a yellow dressing gown
There are three different types of erections men can have (Picture: Getty Images/fStop)

A subconscious erection is the first type. These hard ons usually occur when you’re dreaming – you won’t need physiological or physical stimulations.

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Psychogenic erections are the result of sexual fantasies either fulfilled in reality or in porn, where your body responds to visual stimuli.

The third and final type of erection is the reflexogenic erection. This is an erection which happens because of direct physical stimulation to the penis.

You don’t need an erection to orgasm

We usually associate an orgasm with an erection but you don’t necessarily need to be hard to finish.

So if you can’t get it up, that doesn’t mean you can’t sometimes still have a satisfying end to getting it on.

Some people can experience an orgasm without being fully erect, while some men have reported being able to orgasm with just their prostate being massaged.

Penile stimulation isn’t always a necessity.

Up to half your erection is hidden

Measuring tapes on beige background
Your penis is actually a lot longer than it looks (picture: Getty Images)

Men, your penis is actually a lot longer than it looks.

About 30% of the tissues that make up the male erection are internal, so you can’t see it from the outside.

This means a third or even up to a half of your hard on is hidden.

Penises have penile spines

Don’t panic, your penis doesn’t actually have spines! But, while humans don’t have penile spines, plenty of closely related animals do.

These spines are pointed, keratinised structures found in the genitalia of several animals, which may help to induce ovulation or enhance sensation during sexual activity.

Our distant relative – the chimpanzee – has penile spines, as well as cats, bats and cute fluffy koalas down under.

Myth: The penis is a muscle

Wrong.

Danae tells Metro.co.uk: ‘Some people believe that the penis is a muscle that can be exercised to increase size or improve sexual performance.

‘The penis is not a muscle. It looks like muscle because it gets hard when it fills with blood when it gets an erection but it’s actually made predominantly of spongey tissue and blood vessels.

‘When someone fractures their penis, they break the blood vessels that run in the penis and tear the soft tissue. It’s incredibly painful and really dangerous, that’s a medical emergency.

‘Seek medical attention immediately because if you compromise the blood flow to those tissues, they can die.’

Beetroot and oysters could give you better erections

Dr Danae also said that consuming foods that are high in Nitric Oxide can help blood flow, thus improving your erections.

Foods high in Nitric Oxide are dark chocolate, beets, garlic, watermelon and leafy green veggies.

You might finally have a reason to try oysters too! Foods that are high in zinc are important for good testosterone levels and sperm production.

This includes the divisive shellfish, as well as beef, chicken, nuts and beans.

As seems to be the rule of thumb for every part of your body, drinking plenty of water means you’ll be hydrated and promote healthy blood flow, which can only be good for your erections.

Fresh homegrown beetroots, plant based food
Beetroot and leafy greens could help give you better erections (Picture: Getty Images)

Smoking-related erectile dysfunction can be reversed

While there is a misconception that smoking can actually shrink your penis there is no scientific evidence to that point.

However, this doesn’t mean the effects of smoking on your body don’t take their toll on your sexual performance and satisfaction.

What you probably did learn in biology is that smoking constricts your blood flow, but they may not have touched upon the fact that means you won’t always get sufficient blood flow to your genitals.

If you don’t have sufficient blood flow your erections won’t be as firm so there may be a perceived reduction in size when you’re excited.

Yoxly studies also indicted smoking increases the risk of erectile dysfunction because it damages blood vessels but this doesn’t mean that damage is permanent.

If you quit smoking, you blood vessels can heal which will improve your sexual function.

This article was originally published on January 15.

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