Rigid & Mashie -
I'm glad you've had sensual, bonding experiences with this and I guess everyone has slightly different motivations for their interest. For myself, I've never felt that 'little boy' or 'nurturing' feeling when doing this or other similar things. For me its more about being totally open with someone, sharing something hardly anyone ever does and just being playful. I used to sometimes put a piece of TP in the water so she could have a 'target' to shoot at!
I guess I just like being touched by a partner and being touched in intimate places just reaffirms that this is a special relationship. I've never had a need for 'personal space' when it comes to physical contact - my SO could touch me 24x7 if she wanted! Like when just relaxing and watching a movie or something - touching each other sensually doesnt mean we are going to stop and have sex, its more like foreplay for whenever the next time is.
I do agree Mashie that a person in 'power' many times likes to give that up at home or sexually. Although I see it more on the womans side of course, because I'm looking for a sub. Women who are single moms and work full time and take care of a household have so much to control in their daily lives, making decision after decision, even if they dont have a high powered job. They have a lot on their plate to deal with in todays society. So, I think many of them gravitate towards being submissive because they are tired of being in control and making those decisions. They want to just be 'taken' by their man and bereft of responsibility during sexual encounters. I think it also frees up their mind to enjoy things more, given that they 'have no choice' and things are just being done to them.
The whole D/S, M/S psychology is really amazing...
More OT - Ladies - if you've never done this with your SO, just ask him sometime. Either lead him in or follow him into the bathroom and ask to help or just do it. I sincerely doubt you'll ever encounter resistance!