surveying

how can i survey people about something so personal and intimate as sex and sensuality without invading their privacy? discussion is useful, but can only go so far - how can i get the answers to the questions i want to ask? i dont think even anonymity can help. i think if people have personal secrets they wont want to divulge them in order for me to make a better lamp for a university project (nose in air). so where can i take my research from - the internet? i think theres a lot of looneys out there with no idea about sensuality or intimacy, and even then, i can't take their opinions or advice as they dont answer the questions i have.
sites like this help, but this advice is just the advice of just one person, and i could probably write the same sort of thing (probably with a little less insight, especially into the views of the woman in an intimate relationship).
a lot of what i have read either on the internet of in a few texts have stated that intimacy and sensuality are 2 different things, but they do overlap like 2 circles in a venn diagram. i guess i'd liek to tap into the emotion and mood in this overlapping area.