[Anabasis to Desta]

Love it when girls do that. But only if I'm emotionally invested in the chick. An old picture of me getting groomed by my ex ...

Quote:

Many social animals groom each other, in an activity known as social grooming. Primates provide perhaps the best example of this activity. The trust and bonding it builds is critical to group cooperation. Women, but not men, tend to think people who have groomed one another are romantically involved. People also think that if people who have groomed one another are romantically involved, they are in a long-term relationship rather than one that has just begun. Human mutual grooming plays a role in pair-bonding.

So I'm pretty sure it's one of those weird things girls subconsciously do to get you to commit like leaving scarves or toothbrushes at your place.