Madonna has spoken out about her brief romance with the late John F. Kennedy Jr. , calling him her best sexual partner — but only on one condition. The 67-year-old singer was romantically linked to the son of former President John F. Kennedy and First Lady Jacqueline Kennedy in the late Eighties. Shortly before her relationship with Kennedy — who died in 1999 when the aircraft he was piloting crashed — Madonna had separated from her ex-husband, Sean Penn. In a new video for the LGBTQ+ dating app Grindr, fashion designer Raul Lopez asked the “Material Girl” singer : “ What was your best f***? Who was your best d***-down?” “I’m going to only name dead people,” Madonna said, drawing a line. She then whispered: “John Kennedy Junior.” The fellow panelists in the interview were shocked by Madonna’s answer and gasped in excitement. “Everyone said his d*** was crazy and he was a good f***,” Lopez said about Kennedy .…