New Delhi, June 18 -- American actor Josh Duhamel, 52, has made no bones about revealing that he began testosterone replacement therapy to stay "virile" for his 31-year-old wife Audra Mari. The 'Transformers' actor admits his decision was driven by medical results showcasing low testosterone levels, and has had a positive effect on his energy levels in general. However, doctors warn that this treatment is not for all and sundry - and definitely not for general fitness or anti-ageing purposes.

According to people.com, Duhamel said his wife was one of the factors responsible to begin hormone replacement therapy. "It's important for her that I stay as young and virile for as long as I can," the actor said of his wife, whom he married in 202...