Ou será talvez que, no sentido literal e no idiomático, capo e assobio?

Some practitioners of BDSM enjoy switching — playing both dominant and submissive roles, either during a single scene or taking on different roles at different occasions with different partners. A switch will be the top on some occasions and the bottom on other occasions. A switch may be in a relationship with someone of the same primary orientation (two dominants, say), so switching provides each partner with an opportunity to realize his or her unsatisfied BDSM desires with others. Some individuals may switch, but may not identify as a switch because they do so infrequently or only under certain circumstances. Sometimes individuals switch in just physical roles (top and bottom), and sometimes individuals may switch completely in emotional roles (dominant and submissive) as well. Some switches only switch from relationship to relationship and will stay in that role for the duration of the relationship. (Wikipedia)

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