I'm really good at this but on number 1: it makes the sentence sound interesting. I know I did not help but I just want to give you an idea.
Answer:
I*TS HAVING s*x WITH YOUR BESTFRIEND
Explanation:
The proposition here is - in. <span>A </span>preposition<span> is a word such as after, in, to, on, and with. </span>Prepositions<span> are usually used in front of nouns or pronouns and they show the relationship between the noun or pronoun and other words in a sentence.</span>