It is hard being a man in a time where the line between straight and gay men gets bleak with each passing day. Even though most women are on the front line of demanding for gender equality, the man is still charged with providing safety for his girlfriend/spouse. Showing any signs of weakness such as shivering under duress is not an admirable male trait. The most appreciated shivers are those of pleasure.
Being able to embrace your inner child affords you the freedom of doing ands saying whatever you want whenever you feel like it. This should not be perceived as an excuse to act like a complete kid, it should however help if you could share things that make you uncomfortable. If you are forcing yourself to act all macho to please some girl, you are better off using that energy in a more constructive manner.