Leo is the sign of strength and power. The body part in astrology that Leo rules is the spine. When one talks about having courage you say, "He has good backbone." or, "She's got good spine."
When I say rules, every sign in the zodiac is connected to or aligned with in some way rules a part of the body. This is very helpful in knowing one's health picture, in how to take care of that part of the body. Also, sexually it's an important place because it is sensitive, it is open to eroticism, it can arouse that person, in this case, a Leo.
The Leo loves to have his or her back not just rubbed or massaged. That's more therapeutic. But in sex having the back touched, kissed, stroked prepares a Leo for lovemaking. One of Leo's favorite things to do is, let's say. taking a shower together, taking a bath together, and to take the sponge in warm water and just lathe the back and the backbone. In bed it's a wonderful place, if you're in bed with a Leo, to just lightly, lightly kiss and touch the back. Then pretty soon the Leo will feel aroused. You can always tell because the skin gets flushed. It is a place that Leo enjoys and responds to feeling coddled, feeling the affection from you and feeling aroused.