"However, I feel that other sensual acts can replace orgasm, not just pain. Acts such as foot worship, arse / ass worship, shoe cleaning/boot blacking, etc, can be seen as substitutes for sex. In a sense, a chast sub performing foot worship could be described as "making love" to the Domme's feet. "

-chaste777, http://www.chastitymansion.com/forum/index.php/topic/6053-pain-as-a-replacement-of-orgsam/

"For me, "sex" has been reduced to simple foot worship.
I once posted years ago on one of the ways she did this,
but I think it's worth retelling.

She would allow me to take my cage off, and then fetch the
petroleum jelly. She would often dress up for my "lesson in self
control" as she would call them. She would have me masturbate in
front of Her. She would tease me with her foot, dangling it and
pointing it at me and would order me to stop masturbating before
I could cum and then she would have me scurry over and kiss her
foot as she told me how nice it felt to have her feet kissed and
worshipped. I would be on the edge but unable to cum, with very
pleasant sensations going through me as I kissed and worshipped
her feet. After she was done, she would make me get back in the
cage and she would refer to my worship as my relief.

It was a long time until I was able to accept that I was being
conditioned to be sexless for her.

She had other, similar activities she would put me through, all
conditioning me to enjoy the pleasure of foot worship more and
more, which I learned to do in a serious way. She even began to
call me her eunuch, she said sex was only for her, and that
males are dirty and that making a "mess" in her bed was
disgusting and unacceptable.

It has evolved over the years to where we are now... "foreplay"
for me is now kissing her hand (first base) kissing Her down
there while she is clothed (second base) kissing her feet from
toes to ankle (third base) and, when she is pleased with me, she
will lift up her foot and allow me the intimacy and pleasure of
kissing the bottoms of her toes and feet (which is going all the
way)."

 - slaveboy, http://www.mschristine.com/DOMestic_Blog/2009/07/chastity_foot_worship_and_the.shtml#more