Washington D.C.
The only allowed sexual position is the missionary-style position.

Oregon
It is against the law for a husband to curse or talk dirty during sex.
Oregon
It is against the law for a husband to curse or talk dirty during sex.

Wisconsin
It's illegal for a man to fire off a gun when his female partner has reached orgasm.
Wisconsin
It's illegal for a man to fire off a gun when his female partner has reached orgasm.

Idaho
It's safe to make love in a parked car. Police officers aren't allowed to come up and knock on the window. Any suspicious officer who thinks that sex is taking place must drive up from behind, honk his horn 3 times and wait approximately 2 minutes before getting out of his vehicle to investigate.
Idaho
It's safe to make love in a parked car. Police officers aren't allowed to come up and knock on the window. Any suspicious officer who thinks that sex is taking place must drive up from behind, honk his horn 3 times and wait approximately 2 minutes before getting out of his vehicle to investigate.

Illinois
It's against the law to make love while hunting or fishing on a wedding day.
Illinois
It's against the law to make love while hunting or fishing on a wedding day.

Utah
It is legal to have sex with an animal -- unless performed for profit. It is not considered sodomy.
Utah
It is legal to have sex with an animal — unless performed for profit. It is not considered sodomy.

Nevada
If you have sex with a prostitute, by law, you have to wear a condom.
Nevada
If you have sex with a prostitute, by law, you have to wear a condom.

Minnesota
No man is allowed to make love to his wife with the odor of garlic, onions, or sardines on his breath. If his wife so requests, law states that he must brush his teeth.
Minnesota
No man is allowed to make love to his wife with the odor of garlic, onions, or sardines on his breath. If his wife so requests, law states that he must brush his teeth.

Maryland
It is illegal to sell condoms from vending machines with one minor exception: birth control can be dispensed from a vending machine only "in places where alcoholic beverages are sold for consumption on the premises."
Maryland
It is illegal to sell condoms from vending machines with one minor exception: birth control can be dispensed from a vending machine only "in places where alcoholic beverages are sold for consumption on the premises."

Montana
All sexual activity between members of the opposite sex in the front yard of a home after sundown - if they're nude- is illegal.
Montana
All sexual activity between members of the opposite sex in the front yard of a home after sundown – if they're nude- is illegal.

Texas
Two pigs having sex on Kingsville airport property is illegal.
Texas
Two pigs having sex on Kingsville airport property is illegal.

Pennsylvania
It's against the law to have sex with a truck driver in a toll booth.
Pennsylvania
It's against the law to have sex with a truck driver in a toll booth.

Oklahoma
It is illegal to masterbate while watching two people have sex in a car.
Oklahoma
It is illegal to masterbate while watching two people have sex in a car.

California
Dogs and cats cannot have sex without a permit.
California
Dogs and cats cannot have sex without a permit.

Missouri
Women must never wear corsets because "the privilege of admiring the curvaceous, unencumbered body of a young woman should not be denied to the normal, red-blooded American male."
Missouri
Women must never wear corsets because "the privilege of admiring the curvaceous, unencumbered body of a young woman should not be denied to the normal, red-blooded American male."

These might be fairly ancient laws, but most are still in existence. Know of any others in your state? Put them in the comments.
These might be fairly ancient laws, but most are still in existence. Know of any others in your state? Put them in the comments.