A few minutes? Or you'll get jumped

I'm always reminded in these threads to be thankful I'm not as handsome as (evidently) most men, since when I've dropped off something for a friend who's not there and his wife invites me to stay for lunch I've never been jumped. The only awkwardness I've ever had was with Christian women in bad marriages, so I don't spend alone time with them.
The woman who's teaching me quickbooks comes over for 1.5 hours at a time, and my work station is in my bedroom. She's roughly my age and nice looking, single, etc... should I hire someone to sit in with us?????

'cause so far keeping things friendly and professional seems to be working fine. I mean she hasn't tried to sit in my lap yet