For instance, they tend to falling in love with someone they meet online while other relationships flounder. An online romance turns into a frightening or pathological relationship.
Or they fall in love with people who don't return their affection. Or somebody has a pseud or doesn't tell you it's a same-sex relationship.
Or that they're much younger or much older than you are.
People drawn to long distance romance used to fall in love via the post office or on the telephone.
The Net obviously permits strangers to find one another more easily, get to know one another better and faster, and in a variety of ways, from chat rooms to IRC to video encounters.
A number of people in Gwinnel's practice have met online, fallen in love and been happy together for ages. Others get disappointed by flamers, fakers, and stalkers, or by role-players who aren't looking for real relationships.
Seduction online lends itself both to experimentation and misunderstandings, and to the complications anonymity can breed.
Gwinnell gives advice on how to protect yourself online: how to spot trouble, to figure out when you've gone too far or when someone is going too far with you.
Where she scores highly with me is that Gwinnell brings a sensible, even historical approach to the topic of seduction.
The Net may be new, she writes, but the issues she writes about are not.
People have been meeting and falling in love in odd and unconventional ways ever since people have been falling in love.
Online Seductions could be the perfect Valentine's Day gift, a sane guide to the relatively new world of online romance.