Reading the initial question of this thread has caused me to think a great deal about the issue raised. After a few minutes of personal reflection, this is my answer. Also, my apologies if my thoughts in this instant seem to be all over the map.
I do but not all the time. My partner and I have been together for a while and this is my first sexual partner. Before this, I've watched plenty of television so I got the general idea of how things were supposed to work and porn had painted an ultra-unrealistic portrayal of the mechanics of the task. Neither representation actually shows how messy and germy sex can be. Don't get me wrong, I still love having sex with my partner, but, it is still the exchange of bodily fluids. Oddly enough, this exchange doesn’t bother me at all and I actually look forward to doing it.
Also growing up in a religious household and going to religious schools growing up didn't help at all. There are times that I feel guilt about having premarital sex with my partner and taking her virginity and she taking mine.
Then there is the whole, "Who wants a hot and sweaty man on top of them pumping away, pulling hair and spanking her" issue. Also there is the “Did I last long enough?”, “Did I really satisfy her like I think I did?” and “If I did ‘X’, would it be too weird?” questions. I’m not gonna get into any of those issues here…
It's funny. I’ve purchased a few, more than a few, toys for my partner and the larger toys that I've purchased for her don't bother me at all. I actually encourage my partner to use them. I'm told they can offer different sensations during "alone time". Being a male, one would think that this particular insecurity would stem from that, however, it doesn't. As I pour out all of my insecurities into this thread, I can't help but think that I need to get out of my head.
All the issues listed above are some of the reasons I’m on this message board. I’m here to learn more about the other sex and some of the things they find satisfying. Hopefully, gaining knowledge will put my insecurities to bed.