there are a few male cats that hang around the neighbour hood, but there is 1 female cat, she seems to always hang around with another tabby male cat. when it comes to my cat she hisses at him.
what cold it be, i have caught them on many occasions in conflict.
Is your Tom neutered? She - being stray is probably in heat and is not interested in him - Your cat might show interest in her - though altered since I have read Dr Jean said that even a neutered Tom will react to extremely active hormonal activity in a female...although unable to perform any mating act.
If your cat goes only sometimes outdoors and doesn't "hang out" all the time he does not have so much of an active role in the group...the same goes if he is not neutered - she is probably loyal to her sweetheart of the moment.