Sexual Acts

"Having sex" doesnt necessarily mean penetration. Expression of sexuality can also include oral sex, touching or contact with the genital area or anus. Kissing (mouth to mouth) doesnt usually qualify as sex and STDs are not typically, but could be spread that way.
Sexual intercourse/penetration
The penis is placed into the vagina or anus
Oral sex (Blow job/Goin Down On Someone)
Kissing, licking or placing the mouth on the genitals (vagina or penis) or anus
Fondling /Petting/Stroking
Touching the breast, genitals or butt
Anal sex
A finger, penis or other object is placed in the anus
"Fingering"
A finger is inserted into the vagina or anus for sexual excitement
Touching or Kissing the Breast
Masturbation
Stimulating yourself for sexual excitement