Is sex with an uncle illegal in the UK?

Answer 1

Yes, any form of sexual activity or marriage with a blood relative, is considered incest in the UK and therefor is illegal, includes

Mother, father, siblings, uncle, aunt, granparents, half brother/sisters, even adopted parents (don't know about adopted siblings),

are all considered illegal.

however, the only thing not listed there is not considered illegal in the UK is sexual activaty with 1st cousins, marriage is also not illegal, so your uncle can become your father and your aunt can become your mother

Step brother and step sister marriages aren't really illegal, this is where people have got confused, it depends on the family, if they were raised from birth or children as step siblings.

Usually, the basic of things in the UK is, if you have a really close blood relative, it's illegal, the whole idea is, we don't want inbreds.

the above information is correct and can be checked by looking at the sexual offences act 2003