Tickling is the act of touching a part of a body, in a way that causes involuntary twitching movements or laughter (Dictionary.com/Retrieved. 2012.05.27).
This is just a definition. As you know people's reaction could be pretty different when being tickled. For someone it causes nice feelings but for others it's a torture.
I think everything depends on what kind of touches does she/he get and who touches her/him?
It's absolutely different feeling when one of your colleagues try to tickle you or one of your relatives do the same. Or imagine what if your lover makes you laugh this way...
So tickling could be an exciting play between couples, if they give erotic energy to every ticklish motion like stroking, rubbing, licking, etc.
With the help of this book you can get the most of erotic tickling. You can get know each other's weak/erogenous spots, strengthen your relationship while having fun, leave your comfort zone to experience a higher level of joy. Getting together till your limits could stabilize your relationship mentally as well.
Don't forget. Tickling is a really intensive foreplay too.
And foreplay is the key for better sex and exuberant orgasm...
ONLY FOR ADULTS. OVER AGE OF 18.