Interesting article about potato v ordinary leaf tomatoes. It seems that what really matters is whether the stigma sticks out of the flower or not. If its sticky-outy "exserted" its likely to cross with other toms. That's something new I've learnt today. 
https://blog.seedsavers.org/blog/explori...-structure
In a nutshell https://theseeddetective.co.uk/saving-tomato-seed/
https://blog.seedsavers.org/blog/explori...-structure
In a nutshell https://theseeddetective.co.uk/saving-tomato-seed/
The Moneyless Chicken says:-
Use it up, wear it out, make it do or do without.
Use it up, wear it out, make it do or do without.
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