"intercourse" means the physical act of coming into close contact or connection with another person, usually referring to sexual activity. Full definition
You can sometimes present symptoms two to four weeks after sexual intercourse with an infected partner. (advocatesaz.org)
This will happen when a woman has released more than one egg and has had sexual intercourse with more than one partner a few days apart. (intelligentmother.com)
Women who are actively charting their cycles in hopes of getting pregnant will usually have an idea of whether or not they are fertile at the time of intercourse. (mommyedition.com)