Good on them! This story highlights the absurd and arbitrary moralising taboos that our society likes to construct around sexual relations. Emotions between siblings are complex, people are complex. To deny our complexity, as Christians would have us do, is absurd. Live and let live. Richard Burdon, Nottingham

Totally disgusting. Both of these people needed help to believe this was normal and OK. How could anybody say that this seemed to be a healthy relationship? It’s no different from a father or mother having sex with their child! Do we think that is OK as well? Shawna, Nashville, US

This is like Sodom and Gomorrah. Just because the parties involved are OK, should society accept it? You forget that you are not living on an island where you can set your own rules. Legally this is wrong and there’s a reason why the law is put in place. Kenny, Kuala Lumpur, Malaysia

If incest were to be allowed, for one happy girl there would be 10,000 unhappy ones. John, Southend

Lord Byron and his sister

From the heights which might have made him happy as the husband of a noble woman, he fell into the depths of a secret adulterous intrigue with a blood relation

• Lord and Lady Byron

• Leading article: Lord Byron

I used to have sex with my brother

I'm not allowed to be in love with Daniel, but I have good memories of our relationship and don't feel guilty

Background

• I hoped bulimia would make me beautiful

• Family secrets: the grief for my illicit love

• I wish I had married for money, not love

• My mother hated all women

While I don’t advocate incest, I don’t see who they were harming (obviously when they were single). Both were consenting, used precautions and stopped when they got into committed relationships. As long as they didn’t run the risk of procreation there’s no harm done. Well done for publishing this. Jennifer, Chorley, Lancashire

Incest, like absinthe, though intensely pleasurable, cannot be justified in a civilised society. Father Jonathan Obliseque, London

This is a breath of fresh air. I had a relationship of sorts with my sister when I was aged between 14 and 17. As a woman myself I always had pangs of guilt and we have never discussed it since, but it helped me in my own relationships later in life. We are now both happily married with children. Kelsey, Yorkshire

My brother did the same to me growing up until I was 14 years old. I was too young to remember how it started and exactly when. I know I was about 4 years old and I know how it feels. We are still close, like it never happened and now, 25 years on, it’s like it was a dream. Jenny, Willmar, Minnesota

To those who keep saying “but they’re consenting adults, what’s the problem?”, they weren't “consenting adults” when they started this relationship. They were 14 and 15, ages when hormones rule over intellect. Would you be OK with your kids having sex with anyone at that age? Jina, Colorado Springs

Incest is bad and I am surprised some people have the guts to support it as being “harmless”. Soon someone will be praised for having a “harmless, intimate” sexual relationship with their pet. God have mercy! David Kimbowa, Kampala, Uganda

If this is not wrong, then mother-son, father-daughter sexual relations can’t be wrong either. Sometimes I wonder why we were given reasoning faculties! S. K. Lin, Kuala Lumpur

I don’t think it is wrong, it is just something I would never do. For those who are saying, “It is wrong”, that’s absurd. Can you determine what really is right and wrong? There is no right or wrong. Romel Salcedo, Hemet, California

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