I got strength as my "current situation" with my boyfriend once, and this is what I learned from it:
Something that appears scary, and appears to be the "beast" can actually become a friend and a powerful point in the relationship. Let's take, for example, Chuck's obsession with World of Warcraft. I can see that as the beast that consumes 80 hours a week of his time, or I learn how to play the game, and see it as quality time that he and I can spend together working towards a common (although imaginary) goal, and socializing with others. Do I try to kill the beast, or do I make it my friend?
As a sagittarius (and Chuck, my boyfriend, is also a sag) I have a knack for compromise, and for making the man and the beast become one - aka the centaur. So this actually works very well in our relationship, because we're both predisposed to make peace.
In my experience, the strength card teaches us that the greatest strength appears as we turn our enemies into our friends, our fears into our motivation, and our stepping stones in our stairway to heaven. And what relationship lacks fears, stepping stones, and perhaps even enemies?
Keep in mind that we can never turn the lion into a man, a butterfly, or a delicious saag platter. You can never change the nature of something else. BUT - your power, MY power, lies in influencing it's disposition towards me. Not through manipulation, if that were the case, the girl on the card would be leading him into a trap with a rabbit's carcass or something. But through the power of love and acceptance.