For some men, there are two types of foreplay: being touched and the anticipation of being touched. What these guys don't seem to realize is that their version of foreplay is in direct opposition to a woman's largest erogenous zone: her mind. There's no substitute for mental stimulation and intelligent discussion as foreplay. 

Arousal for a woman often starts long before she is consciously aware it is happening. She is turned on by a look... by a statement... by his wit... even his willingness to listen without judgment. Seduction is an art form, and requires effort. It demands focus on her. She wants to feel important. She wants to matter. She wants to feel desired. 

Bottom line: A woman's largest erogenous zone is her mind, with his words and actions being the ultimate tools for effective foreplay.