They say mum and dad know best. But the following people don't really fit the bill, here's why...

Is my son gay? I better make sure he's not!
An Australian father is facing a rape trial after allegedly forcing his son to have sex with a prostitute because he feared the 14-year-old was gay. It is said that during a family barbecue around Christmas time in 2007, the dad allegedly phoned a prostitute and arranged to meet her at a motel.

The man drove his son to the motel and paid the prostitute in 50-dollar notes. The prostitute took the boy into a motel room while the father waited on a balcony.

The father even walked in and out of the room to check on his son and told him he wanted to see a used condom as proof that they’d had sex. After the boy and the prostitute had finished the dad took his son home.

She made minor daughter to have sex with 120 men
A mother of a 12 year old girl in Australia has been charged for forcing her daughter to allegedly have sex with more than 120 men, including a Tasmanian state MP.

The 12-year-old’s mother was charged with a offences relating to supplying her daughter at 100 dollars per half-hour and 50 dollars extra for “no condom”, the Magistrates Court heard. The girl contracted sexually transmitted diseases, according to news reports.

Father forces son to have sex with sisters!
A man in New Zealand has revealed the ordeal he went through after his father allegedly forced him to have sex with his sisters.

The man, now 38-years-old, said his father forced him to have sex with his intellectually disabled older sister, while he sat in the room holding a weapon – possibly a gun.

“We just had to do it. We were both crying and he was just like ‘hurry up’. You’re just so scared,” online news reports quoted him as saying.

The man, whose name has been withheld, also said that just days after the alleged sexual incident with his older sister, his father held a knife to his throat and told him to sleep with his younger sister too. Fearing for his life, the man, then aged about 13, took his sister down to a river bank where they got undressed believing their father was watching from a distance.

He also claimed he witnessed his father raping his teenage girlfriend, but was too petrified to stop it happening, and when the police made contact about the incident his father told him to lie.

Sandwich bag condoms! A breach of trust
A man in Australia, who used clipseal sandwich bags in place of condoms to have sex with his 13-year-old stepdaughter, was caught when he asked her to get a morning-after pill from a hospital.

The District Court in Brisbane heard the man, 38, who can't be named because it would identify a victim of child sex, confessed to his then wife who went to police, according to news reports.

The prosecutor told the court the man was in a relationship with the girl's mother for eight years, had lived with them for five years and been married for a year.

She said the girl looked on the man as her "dad" and they formed a close relationship while her mother was away with firstly an injury and then work.

She also added that the offending involved mutual masturbation, oral sex and on four occasions sexual intercourse.