Things or acts that the Bible prohibits, does it matter how many times it is referenced in the Bible?

If it's in the bible it need be referenced only once. If it is repeated it is most likely for emphasis. You mention prohibitions, I don't know to what you refer.

There is a sharp distinction between the Old Testament and the New Testament. In three of the Gospels (Matthew, Mark, and Luke), Jesus speaks about putting "new wine into new wineskins". Was Jesus all that concerned about bursting wineskins? Of course not. The "new wine" was Christ himself, wrapped in the new wineskin of the New Testament or New Covenant. He even spoke as to how some after tasting the new, would say, "the old is good enough" signifying that some would have difficulty accepting this New Covenant.

As far as the dietary restrictions, most Christians generally agree that in Acts chapter 10 where Peter was told to "kill and eat" of the unclean animals that the concept of the dietary restrictions was removed.

Also, when the question came up during the early New Testament Church, as to whether or not to continue to follow the Mosaic laws, the apostles had a "convention" of sorts and came up with the following guidelines: "that you abstain from things sacrificed to idols and from blood and from things strangled and from fornication; if you keep yourselves free from such things, you will do well." Acts 15:29

Homosexuality is mentioned in Romans chapter 1, along with a reference in 1 Corinthians 6:9.

I believe if it's mentioned in the Old Testament, it should still be a rule, which most Christians just look at the New Testiment, if that's what your referring to. I don't eat ham, even though I love it with an insane passion. If it's a commandment than NO MATTER WHAT it should be fallowed. Some Christians today are hypocritical, and will say to there children "Don't lie," But they'll do it them selves.

It may likely have been the dietary law, which prohibits eating shellfish, pork, rabbit, dogs, cats, bats, etc.. These laws are still in effect whether a person keeps them or not. Some people are confusing the levitical purification laws with the rest of them. The Levites were prescribed certain rules regarding clothing, shaving and so forth as they were a physical representation of the intercessor between man and God. As such, they were required to maintain certain purification rituals and so forth in order to enter the temple. When Christ came, as He died with crucifixion, the temple curtain was torn apart, signifying the reconciliation of man and God, and of our ability to approach Him directly through Christ's sacrifice. To address the question, it does not matter the number of times God relays His Law, whether once or a thousand times, it ought to be kept.

the bible does not say that homosexuality is a sin it says it detestable or an abomination

along with shelfish

how can a shellfish be a sin

sins are something you do

not what you are

i dont think homosexuality is mentioned in the new testament

Leviticus really does a good job covering what is acceptable as it prohibits:

-Homosexuality

-Eating Shellfish

-Mixing different cloths

-Men having an orgasm on the bed

-Eating anything without hooves

Etc.