Female coworker is very touchy with me. Is that normal?

My female coworker, around 10 years older than me, is very touchy with me.

She will often get very close to me when she wants something or just wishes to tell me something.

She's pretty busty so it's not uncommon for her to squezze he breasts into my back while I'm sitting.

She often shares her food with me and propably slapped my ass at least once.

Female coworker is very touchy with me. Is that normal?
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