Many sins that used to be under the cover of darkness have not only made their way to the light in these times, but are even in the spotlight. Our struggle with sin will never be over completely on this side of Heaven, though with the Holy Spirit's help, the power of prayer, and the assistance of other believers, we can win some of the battles.
Let's look at some tendencies. The dictionary defines a tendency as a leaning or inclination towards something, almost like a gravitational pull in a particular direction. A boy or girl growing up in a home where not much affection is shown may feel unloved and may seek to fulfill this natural need for love later in life in a wrong way. They may seek to have intimate relations (outside of marriage) early and often as a way to make them feel loved, and so a tendency develops. Perhaps a person has always used food to comfort them during stressful times and now they have a weight problem that is difficult to overcome.
People may be raised in an environment where yelling and screaming and cursing is the norm and they acquire this habit which later becomes a tendency. Having a parent that was a drunk might lead to alcohol experimentation early on that can lead to alcoholism. Someone can be abused by a person of the same sex and end up confused about their own sexual orientation. There are so many situations . . . and I am no psychologist. The point is that these scenarios--and countless others--can cause possible weaknesses or tendencies in our lives that we may always have.
There are many sins I could use as an example here but I've chosen the sin of homosexuality because it has been in the news so much lately. I pray for the person who has the tendency towards this sin, wherever the tendency came from; not because it is worse than any other sin but because I am limited in my ability to help as I cannot relate. There are those out there however, who have been delivered of homosexuality and can provide help and direction.
Please note that there is a difference in struggling with one's sin and glorifying in it. We all have our weaknesses. There is a struggle when our tendencies come up against our will. We know something is wrong but because of our tendencies, the pull towards a particular sin is strong. This battle may last a long time and come with victory and losses, but the war continues on. When two people of the same gender decide to get married, then they are most likely not struggling with this sin any longer and have either just embraced it or tried to convince themselves and everyone else it is not wrong. They are indeed committing to a sinful lifestyle.
It's important that we remember that lost people are going to act like lost people. We should continue to reach out to them and try to help them find that one foremost thing that every person needs: Jesus. We should do this with love in our hearts but without condoning their behavior or compromising God's Word. For those who choose to continue down this road and claim to be Christians, the Bible again tells us what to do. In 1 Corinthians 5:11 Paul states, "But actually I wrote to you not to associate with any so-called brother if he is a sexually immoral person, or covetous, or an idolater, or a reviler, or a drunkard, or a swindler--not even to eat with such a one."