I agree with @arboretum_amy, there is a tendency for women to respond to surveys at a higher rate. I am a social scientist, and mostly rely on surveys to collect data. I have heard from others that specifically younger men respond to surveys at lower rates. I’ve seen an age bias in my work, not necessarily gender, but I also research populations that are already heavily skewed towards men. After a quick search, I’ve only come up with one piece that identified a gender bias (https://www.ncbi.nlm.nih.gov/pubmed/15100615). I’ll add that identifying and confirming a gender bias in survey response, that is not created by the survey objective or content, is very tricky to do. To do that, you would need to already know the gender distribution of the survey population beforehand. Most research projects using surveys will not have that detailed information.