The bible says you should not wear clothes made of two types of fibre Leviticus 19:19 and Deuteronomy 22:9-11. In Leviticus is is "Do not wear clothing woven of two kinds of material."
Do you wear any clothes made of cotton and artificial fibres? Are they all stitched with cotton (or matching fibre to the cloth)?
Do you eat lasagne? Or Bacon? Or prawns?
Do you gossip?
Have you ever called your brother a "fool"?
The bible isn't actually that clear on homosexuality as a lot of other sexual "sin". It does seem pretty clear that homosexual "rape" is wrong, not so clear on anything else though.
Would you ask the Reverend Richard Coles if he thought gay sex was a sin? And he is more qualified than Tim Farron to comment on what is sin.