However, testosterone patches and gels (Andropatch, Testoderm, Androderm) are only licensed for the one in five 60-plus men who suffers from hypogonadism (very low testosterone levels).
And female testosterone patches and sprays that are on the market as "the female equivalent of Viagra", to treat the newly recognised problem of female sexual dysfunction, are highly controversial.
Physically enjoying food quickens production of this pulsating hormone, as do dim lights and softly playing music, says Odent.
His book The Scientification of Love (Free Association) provides the evidence base for the St Valentine's Day dinner date.
Perhaps the single most important effect is the role of oestrogen in lubricating the tissues of the vagina – with plenty of evidence that the devastating impact on couples' sex lives following the menopause is particularly due to vaginal symptoms such as dryness and discomfort.