Had a Co-Worker who married a gal with two sisters. He was a rather weird duck and after 5 years was divorced..., then married one of his sister-in-laws..., a few years later, they divorced and he married the other former sister-in-law! Obviously that marriage ended in divorce as well! Seems that the sisters never believed what their older siblings told them about him (AWHHH, THAT CAN'T BE TRUE)!
BTW, he was always a hoot at a party or company event! He had quite a following of relatives and co-workers for years..., a LIVE SOAP OPERA FOR US!!
I’m guessing his pheromones fit all of their (genetically similar) chemoreceptors. Chemistry is a necessary but insufficient requirement for long term marriage.