DEAR DEIDRE: I NEVER think of my sister as family but rather as someone I want to have sex with.

We grew up in separate households because our parents split up when I was still a baby.

She lived with our mother and I went to live with my dad and settled abroad.

But they used to organise for us to spend a couple of weeks together every summer in one home or the other.

When she was 14 and I was 16, we touched one another and had oral sex. I have never forgotten it.

We are now 24 and 26. I feel horny whenever thoughts of her come into my mind.

After that first time, we did it again a number of times.

We never had intercourse, although we got close to it.

We have always kept in touch and we say we love one another.

I don’t feel love as a brother, though, but the love I would feel for a lover.

It is weird and I feel horrible about it.

I have told her I think she is beautiful and amazing and she says similar things back to me.

But when I reminded her of that first occasion she said she remembered it too but she did not want to talk about it.

DEIDRE SAYS: You two were raised separately so the normal incest barrier between siblings was not in place but of course sex between brother and sister is against the law.

What you and your sister did as kids was exploration, but following it up as an adult is a definite no.

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