Man the hell up? Lube is generally for sex, not masturbation. No one is going to look at you and go "Wow, that guy appears to be having sex, what a freak", and they certainly won't go "Strawberry flavoured lube? Definitely going for a ****". At worst, you might get a very strange person thinking "Strawberry lube? He's off to suck himself off", but to be fair, he has more to worry about than you in that thought.
People masturbate, people have sex, some people used water-based lubricants to make the whole experience easier/more pleasurable.