Hector and Mary Beth have been married for just a few months. Hector begins to notice that Mary Beth expects him to take out the trash every time. Why can't she take it out once in a while? He decides to ask her about the issue. Mary Beth says she wasn't aware that she was asking him to do it all the time, but she usually thinks about it when she is doing the dishes. When she's up to her elbows in soapsuds, it just seems reasonable to ask Hector to take out the trash. Hector indicates that he will do the dishes sometimes, if she will take out the trash sometimes. Mary Beth agrees. Which strategy for escalating and maintaining relationships are they using?