The same can be said of a newborn. If you are arguing that a baby suddenly possesses a consciousness as it transcends the birth canal then you're a bit foolish. Just because a child hasn't developed a consciousness capable of caring doesn't mean it's acceptable to do what you like to/with it.
Sexually transmitted disease can harm a baby. A woman who fucks a man will have a higher risk of contracting STDs than a woman who abstains, a prossie fucking dozens of random men will have a higher risk again. You are exposing the child to this risk. Then consider your increased risk of being subject to violent crime.
As such you are exposing the child to increased risk, just as with smoking or alcohol consumption. There's no difference, but hey, "your body, your rules" 
My penultimate sentence is not a massive leap. If you're selfish and irresponsible when carrying a child, why should I expect you to be anything but after you've delivered?
I hate to do this but I have to agree with Daff on this one. A baby is a baby regardless of it is outside or inside the womb. From 28 weeks it is now highly viable so is classed as a baby. Before a set amount of time then it is not legally a human life. After that time (they keep changing it last I heard was 28 weeks) it is legally a human being hence abortions cannot be done when that far gone.
TO invite strangers into your home and hope they don't attack and harm your baby is selfish. To have sex with dozens of men risking disease that can cause brain damage, blindness, deafness and many other defects is beyond selfish. What right does anyone have to risk their child being born blind just so they could earn some cash.
Have a disabled child and then tell me it is ok. Watch them suffer on a daily basis, not fit in at school as they are different, feel isolated and alone, it is heart wrenching. It is soul destroying. I am just so grateful that my childs disability was not my fault or due to my actions. If it was I would not be able to live with myself. Knowing they are risking their child being born either mentally or physically disabled well that should be enough to make any pregnant woman ensure she has minimal risks to her child.
Most STIs can cause damage to an unborn child and some happen during birth. Risk your own health as much as you want but don't risk a baby who has no say in it. Condoms are not enough protection against some stis so even using them is not enough when pregnant.
Its your body and you can do what you want with it but NOT when you are carrying another life around in it. Risk your own health as much as you want but never risk an unborn childs health. Believe me making a few grand is not worth a lifetime of that child going through hell whilst trying to live a normal life. Having to then live knowing you could have had a healthy child if only you had not put money first is something I couldn't live with especially as this country has a system where they will give you money to live on whilst pregnant and not working as well as after the birth until you do go back to work so you dont need to work and take that risk
