What degree of Leo is her Venus in?
What degree of Virgo is his Mars in?
Are these two planets within 8 degrees of each other?
(For instance, Venus at 29 Leo would be only 3 degrees from Mars at 2 Virgo).
IF they ARE within 8 degrees of each other, then her need to relate and love (Venus) interacts with how he feels his self-assertion (Mars).
This is called "Venus conjunct Mars), and it is a powerful source of sexual and emotional attraction.
But note that this chemistry is ONLY 11% of what makes a relationship last. So it could be a very good ride .. for only a little while.
When there is a conjunction between Venus and Mars, the Venus person emotionally soothes the Mars person, and the Mars person makes the Venus person more lively.
On the other hand, if her Venus is NOT conjunct his Mars, then they do not connect at all on that level.
It is the aspects between planets that create interaction between two people. The square and opposition aspects, between ANY of her 10 planets and ANY of his 10 planets, creates conflict. The sextile and trine aspects, create harmony. And the conjunction creates either conflict or harmony, depending on the nature of the two planets involved in the aspect.
In order for a relationship to become a significant relationship and to last, one person must have their Ascendant or Descendant conjunct the other person's Sun or Moon or Venus or Mars. Otherwise, the relationship will fizzle out (or explode) within 2 years.
However, if all one wants is a not one-night or one-week stand, any aspect between one person's Venus and the other person's Mars will serve the purpose.
Note that there are many OTHER types of aspects that create attraction and/or sexual attraction.
But that the greater the attraction is at the beginning, the worse the problems will be once the honeymoon period has died out.
No serious astrologer does astrological comparisons using the signs. Because that approach doesn't work. We work one-on-one with our clients, and they tell us is what we are doing is full of BS .. signs don't work. Only the aspects give accurate information that works in real life.