You're also on target in supposing that what is true of mental fantasy is probably even more directly applicable in cases of "virtual" activity.
Others may think of it primarily as a kind of "game" or a high-tech form of masturbation.
It's not easy to categorize these perceptions or sort out their various psychological implications.
different, does my spouse's involvement with cybersex give me grounds for divorce?
I recently discovered that he's been involved in an ongoing "relationship" via the Internet.
You're correct to point out that Jesus equates lust in the heart with the act of adultery.