Ronia's right, there are a number of factors to consider,
Firstly, and most importantly, the house placement of Venus (and indeed the other planets). The simplistic approach to Sun Signs, assumes that the Sun is in your first house (the Ascending Sign) which would put Venus in Virgo in the third house, under a whole sign house system, or second, third or even fourth by quadrant houses, depending on the degree of the Leo Ascendant.
However only a minority of people with Sun in Leo actually have a Leo Ascendant, so in practice Venus can be in any house and that will shift the focus of the way in which Venus actually expresses for that person. So we need to know what the person's Ascending Sign is (and preferably the degree of that Sign)
Secondly, in Virgo, Venus is ruled by Mercury. The placement by house and the sign of Mercury will be important, as Venus and Mercury share a link. A strongly placed Mercury can help a poorly placed Venus and a poorly placed Mercury can pull down a strongly placed Venus.
Thirdly, Virgo is the Sign of Venus' Depression or Fall (it is the Sign opposite her exaltation of Pisces). Partly this is because Pisces is a fruitful Sign, that furthers the natural expression of Venus as a mother or nanny. Virgo is unfruitful, being placed in Virgo goes against part of Venus' natural expression. A helpful Mercury, or helpful aspects can modify these tendencies, as can Venus placed in it's own Terms, within the Sign (7 to 17 degrees).
Fourthly, Venus' phase relationship with the Sun, is important. For modern Astrology, this would boil down to whether Venus is Retrograde or Direct but there's more to it than that, including whether Venus is visible in the night sky, either before the Sun rises or after it sets, it's speed and whether it is about to rise out of the Sun or set into it.
Fifthly, as Ronia points out, aspects between Venus and other planets can boost or detract from the way in which Venus is expressed. At its simplest, Venus aspected by planets that tendh to have a constructive role in the chart tends to be boosted, especially if the aspect is a Trine or a Sextile. Whereas Venus aspected by planets that tend to be more negative or destructive in their effects, especially by Square of Opposition can take away from Venus expression.
Finally, Modern Astrology tends to concentrate heavily on character traits and personality analysis but Venus can naturally indicate far more. There are a whole range of professions and interests associated with Venus, which range from wearing or making jewelry, collecting ornaments, interest in interior and exterior decorating, music and the arts, the hotel and catering industry and the entertainment industry. That list isn't exclusive, you can find more but your friend may express Venus not through his character but through his hobbies or his chosen profession.
There's quite a bit to consider and in many ways that's the point. Two people with Sun in Leo and Venus in Virgo may express Venus in totally different ways because of variations in the above (even including the actual degree of Venus in Virgo).