Towards the end of filming, in early February 1964, Sellers met Britt Ekland, a Swedish actress who had arrived in London to film "Guns at Batasi". On 19 February 1964, just ten days after their first meeting, the couple married. Sellers soon showed signs of insecurity and paranoia; he would become highly anxious and jealous, for example, when Ekland starred opposite attractive men. Shortly after the wedding, Sellers started filming on location in Twentynine Palms, California for Billy Wilder's "Kiss Me, Stupid", opposite Dean Martin and Kim Novak. The relationship between Wilder and Sellers became strained; both had different approaches to work and often clashed as a result. On the night of 5 April 1964, prior to having sex with Ekland, Sellers inhaled amyl nitrites (poppers) as a sexual stimulant in his search for "the ultimate orgasm", and suffered a series of eight heart attacks over the course of three hours as a result. His illness forced him to withdraw from the filming of "Kiss Me, Stupid" and he was replaced by Ray Walston. Wilder was unsympathetic about the heart attacks, saying that "you have to have a heart before you can have an attack".