My rephrasing based on William Lilly’s Christian Astrology, page 316 under the header “Has she a Lover”. Initially, I took that to mean whether your existing partner has a lover other than you. After much thought, I think this section is on whether a person is single or attached but not married. I imagine this is something that people, especially men, asked astrologers when they are seeking partnership although I stand corrected.
Is the Lord of 7th void of course? If yes, s/he does not have a lover.
Does Lord of 7th conjunct north Node? If yes, s/he does not have a lover.
Does Lord 7 or the Moon conjunct Mars? If yes, s/he probably has one.
Practical Astrology 