Japanese swimming star Daiya Seto has admitted to having an extramarital affair and offered a "deep apology" following a weekly magazine report, his management company said early Thursday.The Shukan Shincho magazine published an article in its online edition Wednesday saying Seto had visited a love hotel in September with a woman who was not his wife.Seto said in a statement released by his management company, "My careless act hurt my precious family and caused trouble and dismay for all my supporters, sponsoring companies and many other people.""With deep remorse, I would like to discuss w…READ FULL ARTICLE