Pfft. Stereotyping, again. I know personally plenty of gay couples whose relationships have lasted longer then those of straight marriages. They have raised children together and can hardly be called selfish.
If homosexuality is a chosen behaviour then so is heterosexuality.
You are reading the bible the wrong way.
In 1 Corinthians 6:9-10 and 1 Timothy 1:9-11, there are two major issues to consider when one approaches these passages: translation and sexual practices of Greek culture. A comparison of these verses in several translations of the Bible indicates that there is some confusion about how to translate two Greek words in these lists of vices Paul has enumerated. The two words are 'arsenokoitai' which is rendered in various translations as "homosexuals," "sodomites," "child molesters," or "perverts" and 'malakoi' which is rendered in various translations as "catamites," "the effeminate," or "boy prostitutes."
These Greek words are difficult to translate in the context of these passages. Malakoi is a common term and means "soft." It can refer to clothing (Matthew 11:8) or moral matters, meaning, "undisciplined." Arsenokoitai is a rare word and is made up of arseno meaning "man," and koitai meaning "bed, lying, or having sex with." When put together the word may mean "male prostitutes."
When these words are placed in the context of Greek culture in which Paul was writing, the passages have very specific meanings.
The Mediterranean world had a definition of sexuality that was based on dominance/submission and unequal status. Greek culture fine-tuned that definition with regard to status. Proper sexual relations occurred between people whose status was unequal. In addition there was a practice in ancient Greek culture known as pederasty in which younger men were socialized and educated through a close relationship with an older man. These older men were the boys' (age 12 or 13) patrons and, often, their lovers.
These relationships were seen as the key to raising up the next generation of city leaders and there were strict rules about how long the relationship should last and the roles of families within these relationships. Evidently there was some abuse happening in these relationships and young boys were being exploited and kept by the patron well after the boy had grown into adulthood (which would have made him an equal, hence violating the code of sex only among unequals).
These abusive relationships are what the apostle Paul is referencing, not mutually loving and caring relationships between people of the same sex.