This can include touching of the woman's bare legs, breasts, and hips. This can lead to the touching of private-areas.
For some, this can lead to stimulating one-another's private regions by Touch.
In more hardcore culture, this can also include oral sex or fingering. See also Mutual Masturbation
Fellatio being oral sex performed on a male, involves a penis being placed into ones mouth, commonly known as a headjob, sucking off or a blowjob, although one generally does not blow when performing.
Cunnilingus being oral sex performed on a female, involves a tongue entering a vagina, commonly known as licking out and eating out.