Here are some tips from the legend herself. Wendy81!
Taken from her post a few years ago. I wonder where she disappeared
to. 
A good handjob depends on various criterion.
1. Different speed
2. Different strength
3. Massages and strokes
4. Groin
5. Rimming the anal
6. Foreskin and penis head
7. Facial expression
You must be thinking why facial expression. It is because, a girl
can also enjoy the process of handjob with the man without thinking
that its just to pleasure the men. The girl usually get 'served'
better after a good handjob unless the man is selfish and hard to
be satisfied.
Making the guy feel great by caressing and kissing him
passionately would be pleasurable to the girl too as he erects.
[Psychologically speaking it maybe due to the satisfaction the girl
gets as her ego expands when the guy does erect with the kinda
caress given to him]
When the guy erects, the girl does a handjob to make the guy feel a
level better [Only if the girl does not only just pump and down the
manhood, but do know how to handle the gear in a way he feels much
better than the normal caress].
After the handjob, if the girl can rub and fingers herself for the
guy would be a turn on as she does for him while she does it on
herself while he watches.
And after all foreplay, about 1hour later, either the couple cums
by handjobs for each other or an enjoyable process of making
love.
