logo in the first page only

The command to be used to display the logo only in the titlepage is \titlegraphic.

For example:

\documentclass{beamer}

\author{Me}
\title{The title}
\institute{My institute}

% logo of my university
\titlegraphic{\includegraphics[width=2cm]{logopolito}\hspace*{4.75cm}~%
   \includegraphics[width=2cm]{logopolito}
}

\begin{document}
\begin{frame}
\titlepage
\end{frame}

\begin{frame}{Test 1}
test
\end{frame}

\begin{frame}{Test 2}
test
\end{frame}
\end{document}

I report the first two frames:

I had a similar issue and didn't like the titlegraphic solution. Here is what I did:

\documentclass{beamer}

\author{Me}
\title{The title}
\institute{My institute}

% logo of my university  
\logo{\includegraphics[width=2cm]{logopolito}\hspace*{8cm}~%
  \includegraphics[width=2cm]{logopolito}
}

\begin{document}
\begin{frame}
\titlepage
\end{frame}

\logo{}

\begin{frame}{Test 1}
test
\end{frame}

\begin{frame}{Test 2}
test
\end{frame}
\end{document}

This gave me the following output: