These two powerfully strong-willed signs can prove excellent unless either tries to control or dominate the other. There is no limit to what they achieve if their goals coincide and they strive together. Leo frank and open, will not understand Scorpio's secret, subtle maneuver and Leo often will disapprove of them. Leo is a symbol of true love. The 'S' in Scorpio stands for sex.
Scorpio-Leo Compatibility

If that love and sex are put together you've got a winning combination; and it's bingo every time. Leo-Scorpio Compatibility Both of these adamant amours wants to dominate the other, in their one sweet way. Leos operate overtly, making no bones about being the boss while Scorpios scheme secretly behind the scenes, plotting and planning psychological parlor games. The moment the quest for power becomes paramount, both partners will use their secret weapon-sex. If love is to last, these two have both got to learn to give way more and not be so incredibly intransigent.

Aries (Mar 21-Apr 19) Taurus (April 20 - May 20) Gemini (May 21 - Jun 21)
Cancer(June 22 - July 22) Leo (July 23 - Aug 22) Virgo (Aug 23 - Sept 22)
Libra (Sep 23 - Oct 22) Scorpio (Oct 23 - Nov 21) Sagittarius(Nov 22-Dec 21)
Capricorn (Dec 22 - Jan 19) Aquarius (Jan 20 - Feb 18) Pisces (Feb 19 - Mar 20)

In general the above Generic compatibility analysis hold good for all zodiac signs. If you are looking for in-depth compatibility analysis or if you are a professional astrologer the below analysis of Zodiac signs Compatibility - between different gender of zodiac signs will give you detailed answer. Click the below link to learn more.

Scorpio Man

Scorpio Man Compatibility

Scorpio Man and Leo Woman

Scorpio Woman

Scorpio Woman Compatibility

Scorpio Woman and Leo Man