Is kissing between an adult and a minor illegal?

If you don't want to get prosecuted and in lots of trouble you should not have any intimate contact whatsoever with the minor child nor date the minor child. That's why they invented the term "jailbait.'

Sixteen is the age of consent in Michigan for sexual activity, so even if ordinary kissing fell into that category (which it doesn't) you would still be in no danger of prosecution provided the kissing was consensual.

Under the California Penal Code section 647.6, it is a crime for any person to ?annoy or molest any child under 18 years of age. Kissing with the intent to arouse sexual feelings falls under this section. A short kiss without tongue action does not fall under this section. Violation of this section is a misdemeanor punishable by up to one year in county jail, and/or a fine not exceeding $5,000. Each subsequent conviction under this section is punishable as a felony. This offense is a registerable offense under Penal Code section 290, if you are convicted of the offense the court can require that you register as a sex offender for the rest of your life.

In Michigan the age of consent is 16 and therefore no legal issue.

Kissing be sexual but not always. In Michigan the age of consent is 16.

In Michigan, the age of consent to have sexual intercourse is 16, unless you are in a position of authority or control over the girl (like a coach or teacher or something like that). So yes, kissing is fine as long as she consents.