Written by: A O’Neill, Licensed Pest Control Technician


When it comes to insects, it’s not always easy to see the difference between males and females, and a lot of the time it’s not important, except when it comes to bed bugs.

If you find a lone bed bug in your bedroom, depending on whether it’s a male or a pregnant female could determine if you might have an infestation on your hands.

Do male and female bed bugs look different? Yes, they do, but it can be difficult to tell them apart, so how do you?


photo of male bed bug vs female bug and difference in abdomen shape
Image credit: NPMA/T Myers

As can be seen from the photo above and in these pictures of bed bugs, bed bug males and females look almost the same. They both have the same identifying features: 6 legs, 2 antennae, brownish-red in color, and roughly the same size at 5 mm in length and between 2.5-4 mm wide (the female is slightly larger than the male).

Where the difference between male and female bed bugs is obvious is at the end of the abdomen and this will tell you if it is a male or a female. The male bed bug has a pointed abdomen, more like a v-shape, and the female bed bug has a rounded abdomen, more like a u-shape.


Bed bugs are gonochoristic, which means there are two distinct sexes, and the male and female reproductive organs are different. Therefore, the female needs a male to reproduce, so she must be fertilized by a male so she can lay eggs.

A common question is whether male bed bugs can lay eggs? and the answer is no, they are not able to as they do not have the reproductive capacity.

Once the females have reached adulthood they are able to reproduce, and they can only do this if they have had a blood meal.

In fact, both male and female adults must have regular access to blood meals to keep reproducing.

After feeding, the male is keen to mate and will seek out a recently fed female. The mating process is called traumatic insemination. This takes place by the male basically piercing the female’s abdomen with a needle-like intromittent organ and inseminating her abdominal cavity where the sperm travels to her ovaries for fertilization.

The eggs hatch in 7-10 days and the nymphs mature in approximately 5 weeks or so. When they become adults, the females and males will repeat the cycle and mate and reproduce causing a growing infestation.

Each adult female can lay between 200-500 eggs during her lifetime!


Both male and female bed bugs need blood to live and reproduce, so both will bite and feed when hungry.

Male and female nymphs go through five growth stages before they reach adulthood. However, before they reach each stage, they must take a blood meal so will actively seek out a host.

Once they become adults and as long as they have access to a blood meal, both males and females will feed repeatedly throughout their lifetimes.

How can you tell if you’ve been bitten? Telling the difference between a bed bug bite and a bite from another insect is nearly impossible. But one tell-tale sign is if after waking you notice red welts on areas of skin that are exposed and not covered by the duvet when sleeping.

Although some people don’t react to the bites at all, so looking for other signs of bed bugs will need to be carried out.

The good news is that bed bugs do not spread disease and their bites are not contagious.


As both sexes need each other to continue the species, you could say they that neither one is worse than the other, except for when you find a solitary bed bug in your room.

If you identify it as a male bed bug, then once you’ve killed it and thoroughly inspected the room to make sure there are no eggs or other bed bugs hiding on the bed or nearby furniture, then you haven’t got much else to worry about.

But you’ll want to know how the bed bug got there in the first place, and if you click on the link you’ll hopefully get a good idea.

On the other hand, if you’ve identified it as a female, then this is when the female bed bug is worse to have than a male.

Why? The female could be a fertilized bed bug, which means she is actively seeking a blood meal so she can continue with her egg-laying process, which in turn, leads to the eggs hatching and becoming an established infestation.

Of course, this isn’t something anyone wants, so here’s some further information on what it could mean if you only find one bed bug.

Clearing any clutter from the room makes it easier for you and for PMPs to find any hiding spots of a solitary female.

Either way, finding a male or female bed bug in your home can be worrying, so always take measures to find out where it came from to prevent anymore finding their way in.

You might also be interested in:

What do bed bugs look like? 65 bed bug images and pictures
How to permanently get rid of bed bugs in 9 steps
What you should not do if you have bed bugs
How long does it take for an infestation to show?

Anthony O’Neill, Licensed Pest Control Technician is owned by Anthony O’Neill. I’ve been in the pest control industry helping people get rid of their unwanted pests for over 20 years, both in the UK and Canada.

As a licensed pest control technician I’ve seen and treated just about every common household pest, insect or rodent, you can think of. I’ve seen the damage caused when an infestation has been left too long and has become hard to get rid of. But what is more concerning to see is the effect and hardship caused to the homeowner, when this could have been avoided.

For this reason, was created. I understand how stressful it is for you when you find a pest invading your home. By having honest advice and the right guidance to hand, along with scientific evidence to back up claims, you are given information on the best eradication methods, as well as how to get rid of most pests yourself.