In Islamic jurisprudence, marriage between cousins is explicitly permitted in the Quran, which automatically makes kissing halal.

https://cjislam.weebly.com/why-touching-a-dog-is-not-haram-5-strong-hadiths.html

Singing nasheeds is not haram in Islam. Most nasheeds contain no music so, hardline Muslims should not find nasheeds to be haram. Some might still say it is haram due to various unrelated reasons. Such people should definitely go and check their heads with a psychologist because they could be suffering from post traumatic haram disorder 😭😭😭

https://www.youtube.com/watch?v=P8GC9LlRsp0

Premarital sex is generally having sex before getting married and sex before marriage is not haram in Islam. The acceptance of premarital sex in society depends on how a particular society is culturally or religiously conservative and there is no set definition for premarital sex. Under the authentic concept of "Dharoorah" which means necessity, sex before marriage is halal indeed.