It is when you switch tactics during sexual activity.
Can be:
Switching from oral to intercourse
Switching from bottom to top
Switching from rubbing to licking clit
Etc.
I have a real kink for sex switching.
Babe, I know you like sex switching.
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When you give a blowjob and get fucked at the same time, usually in a threesome with 2 guys and a girl.
Dude, let's sex switch this girl