@Catsclaws00,
You are wanting to start an affair with a married man from work. There is no way this will not create a scene. This affair will not stay hidden for long and you need to be aware of the implications of the optics.
Chances are this senior manager's wife has been involved with the company's social functions for many years. Other management executives know who she is and have had personal interactions with her. She will have the advantage of despairing your reputation as a home wrecker, which, of course, you are.
That, in turn, will show how you have disregarded not only your career but his too. It will show the current management how both of you have willfully cheated established norms. They'll have to conclude if you can cheat in your personal life, how much can you cheat their business, their relationship with customers & competitors, suppliers and other working relationships.
I'm sure you've read the company's guidelines on work relationships. Your livelihood will be on the line and possible termination will be imminent. He'll get a possible demotion or passed over for advancement, bonus compensation, stock options and other assorted monetary compensation he's eligible for as a senior manager.
You'll cause strife in a marriage, possibly a divorce, alimony, child support and a second home he'll have to afford after his wife kicks him to the curb because he's a lying asshole who cheats with a floozy from work.
All because your whim of sleeping your way through Life sounds more appealing than finding a love interest of your own who isn't entangled in a current marriage.
So I still ask...
Why?