With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Pornhub is a website for pornography.
text_B: Kenneth Alexander Howard , 1st Earl of Effingham , -LRB- 29 November 1767 -- 13 February 1845 -RRB- was a British peer and soldier .. peer. Peerage
not_related.