First base = kissing, including open-mouth (or French) kissing. Second base = petting above the waist, including touching, feeling, and fondling the chest, breasts, and nipples.

What is considered 1st 2nd and 3rd base?

Some people only consider French kissing as getting to first base. Second base is direct physical contact, usually meaning his hands to her breast. It also includes other forms of petting, touching and groping. Third base may include manual or oral sex for either partner.