This doesn't work with all guys, but for some of us, the scalp
is an erogenous zone -- a part of the body that triggers a sexual
response when touched. We all have erogenous zones. The mouth is
one (that's why kissing feels so good!). The anus is another common
erogenous zone, and the skin between the anus and the primary sex
organs. For many women and some men, the nipples are an erogenous
zone.
Chances are, some parts of your boyfriend's head are more
sensitive than others. For a lot of people, the back of the neck
and the scalp above it are erogenous zones.