Where did Jesus speak out against sexual immorality? He spoke out against fornication, which is sex absent a caring relationship. Fornication is sexual exploitation.
That actually depends on which translation of the Bible you want to use.
Mark 7: 23
New International Version
For it is from within, out of a person's heart, that evil thoughts come--
sexual immorality, theft, murder,
New Living Translation
For from within, out of a person's heart, come evil thoughts,
sexual immorality, theft, murder,
English Standard Version
For from within, out of the heart of man, come evil thoughts,
sexual immorality, theft, murder, adultery,
New American Standard Bible
"For from within, out of the heart of men, proceed the evil thoughts,
fornications, thefts, murders, adulteries,
King James Bible
For from within, out of the heart of men, proceed evil thoughts, adulteries,
fornications, murders,
Holman Christian Standard Bible
For from within, out of people's hearts, come evil thoughts,
sexual immoralities, thefts, murders,
International Standard Version
because it's from within, from the human heart, that evil thoughts come, as well as
sexual immorality, stealing, murder,
NET Bible
For from within, out of the human heart, come evil ideas,
sexual immorality, theft, murder,
Aramaic Bible in Plain English
“For from within the heart of the children of men proceed evil ideas, adultery,
fornication, theft, murder.”
GOD'S WORD® Translation
Evil thoughts,
sexual sins, stealing, murder,
Jubilee Bible 2000
For from within, out of the heart of men, come forth the evil thoughts, the adulteries, the
fornications, the murders,
King James 2000 Bible
For from within, out of the heart of men, proceed evil thoughts, adulteries,
fornications, murders,
American King James Version
For from within, out of the heart of men, proceed evil thoughts, adulteries,
fornications, murders,
American Standard Version
For from within, out of the heart of men, evil thoughts proceed,
fornications, thefts, murders, adulteries,
Douay-Rheims Bible
For from within out of the heart of men proceed evil thoughts, adulteries,
fornications, murders,
Darby Bible Translation
For from within, out of the heart of men, go forth evil thoughts, adulteries,
fornications, murders,
English Revised Version
For from within, out of the heart of men, evil thoughts proceed,
fornications, thefts, murders, adulteries,
Webster's Bible Translation
For from within, out of the heart of men, proceed evil thoughts, adulteries,
fornications, murders,
Weymouth New Testament
For from within, out of men's hearts, their evil purposes proceed--
fornication, theft, murder, adultery,
World English Bible
For from within, out of the hearts of men, proceed evil thoughts, adulteries,
sexual sins, murders, thefts,
Young's Literal Translation
for from within, out of the heart of men, the evil reasonings do come forth, adulteries,
whoredoms, murders
Mark was originally penned in Greek, and though I have searched, I can't find the original transla