Want to become his concubine/Mistress- how would you react?

I'm well educated, have an excellent job, hear I'm beautiful all the time. I want a no strings attached, physical relationship with an older man that caught my eye. He looks seriously interested in me (flirting, eye contact, touch etc.). I do not want marriage/children & am able to be totally independent (been married, divorced, been there done that- not my cup of tea). So my question to the guys are (preferably 30 years & up): As a representative of the male population, how will you react if a lady you like, straight out tells you she wants you with no strings attached? Is it sexy/slutty or totally unacceptable?
Want to become his concubine/Mistress- how would you react?
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