Earlier quoted context omitted.
Then don't write "I guess it is common", state the number of women who told you such things. Personally I haven't heard many such stories from women in tech. Also differentiate between some colleague being interested in them and boss proposing sex on first day.
Have you tried asking them? It feels vaguely ridiculous to expect hard data and facts on things of "people told me". I know I have female friends who have told me similar stories, but I couldn't for the life of me remember how many, nor would I want to start iterating these anecdotes to a stranger on the internet. In exactly the same way it would be to start statistically analysing any other statement on "people told…
Don't understand your comment about lines in the sand. What do you mean?