Wow. I was taught that THOU SHALT NOT COMMIT ADULTERY pretty much covered homosexuality as well as other things. Example:
This Commandment is to allow men to better understand that wrong use of bodily communication with other men has a definite disgrace in God's Plan. Promiscuous involvement to satisfy only the senses has many areas wherein men sin against their role in God's Plan.This Commandment definitely says that homosexuality, lesbianism, abortion, pornography, and all promiscuous endeavors of man, have a permissiveness that is against the reason for creating mankind.
God said to Moses, Men will have many excuses and will justify their sins against this Commandment. Also, men will deliberately attach only specific sins on this Commandment, for shame will make them call this The Hidden Commandment.
I found the above text here.
The Hebrew of the 7th Commandment Lo Tinof (Exodus 20:13) literally translates as, "Don't be vile," and includes all forms of sexual immorality that are covered in more detail in Leviticus 18.