Harry Styles ' friends are growing concerned his whirlwind romance with Zoë Kravitz is steering into dangerous territory – with insiders telling RadarOnline.com the actress' controlling streak and sexual adventurousness are proving too much even for the famously experimental pop star.

The 31-year-old singer and the 36-year-old actress-director confirmed their relationship last month and have since become one of Hollywood's most high-profile new couples . They were seen holidaying in Tuscany last week, and Styles has already met Kravitz's father, musician Lenny Kravitz , 61. Article continues below advertisement

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