I like forming friendship groups with people from the internet, in friendship web pages or similar, and I like them to be mixed with a similar percentage of women and men.
But there's a problem with this, making a woman to join the group is waaaay harder than making a man to join, easily I've to send 7 times more messages to women so the same number of men join.
This gets tiring some times, apart from wasting my time, specially if I try to build the group with a certain characteristic shared by all members it can become a titanic effort; they are free not to answer me if they aren't interested in a friendship group, as some men do, but I'm pretty sure that most that don't answer me is because they think my proposition for the group is just so I can flirt with them.
The latter is proved further sometimes when they start asking more questions to ensure that the group exists and in some cases where they looked somewhat interested when I've asked their phone number to join a whatsapp group so it's easier to maintain contact they suddenly stop talking to me.
Right now I send the messages in a neutral tone just talking about wanting to make the friendship group which their objectives would be and if they are interested in joining it.
I think this situation cannot be helped, but maybe I'm missing something that could make them less suspicious or even if they are that they would think "even if I give him my phone, I could easily block him if he upsets me, so there's no point in saying no if I'm interested in trying a friendship group, for God's sake".
How could I better invite these women so that they understand what the invitation is (and isn't) and that encourages them to feel more at ease in joining?
Edit: I'm explaining things better due to Ash request.
I mean a group to be friends, in which we get to go to places, or share a similar hobby or something like this. Yes, making friends, specially making them in a way where our friendship is likely to be more possible, as I look if we have similar hobbies or the like. I'm messaging strangers, with friendship web pages I thought it was clear.
Edit: I'm explaining some other things due to Imus answer.
I wouldn't call myself a random stranger, I ask women who are in friendship pages where they clearly state that the wish to have a friendship group, I'm offering them an opportunity to do so. If they aren't willing to trust even giving a phone number, how are they going to make friends if they distrust that much? Why they even bother registering on the page?
Also when they are finally on the group the first places I propose to go are always ones in the most crowded areas of the city, so they have no point of being suspicious.
I like more a mixed ambient in a friendship group, and as I'm the one who's building it, it's fair to do it the most of my liking as possible.