Romans Chapter 1 verse 26 makes it clear that intimacy between women is forbidden. I know it by heart—God gave them over to shameful lusts. Even their women exchanged natural sexual relations for unnatural ones.
Chapter 5 Page 91
Gods' rules, hard though they may be at times, are right. You don't have sex until you're married, marriage is between a man and a woman, and the only thing that makes either of you free to find another partner is when one dies. Until death do us part is what the marriage service says, and I think that's precisely what God intends