Whosoever looks on a woman to lust after her has committed adultery...no adulterer shall inherit the kingdom of God...the Holy Bible
Non lesbian girls only club, gotcha.
Jesus threw down the hard line with those words. Most think that having sex outside of marriage is adultery, but with those words, Jesus said, nope, thinking lustful thoughts is adultery, too.
It blows most people away, even many Christians, who all think that sin happens only when we take action. Christ is saying our thoughts themselves can be sinful, too.
We sinners are blessed that He gave us an out by our acceptance of Him as our savior through His sacrifice.